5778
The Sun's surface temperature is about 5,778 kelvin.
- Even
- Composite
Where 5778 fits
Why 5778 is special
The core reaches around 15 million kelvin, so the surface is comparatively cool — and the corona above it is hotter still, at over a million kelvin, which is a genuinely unsolved problem in solar physics rather than a measurement error.
Same number, different meanings
How 5778 is understood across different contexts — never implying one meaning because of another.
- Mathematics
The core reaches around 15 million kelvin, so the surface is comparatively cool — and the corona above it is hotter still, at over a million kelvin, which is a genuinely unsolved problem in solar physics rather than a measurement error.
- Technology & computing
Colour temperature names a light by the temperature of the hot body that would emit it, which is why a photographic 'daylight' setting is quoted in kelvin at all. The Sun's own effective temperature is about 5,778 K, but the light arriving at the ground is bluer — the atmosphere scatters the short wavelengths across the whole sky — so the daylight standards used in photography and display calibration sit higher, around 5,500 to 6,500 K. The gap between the star's temperature and the setting on the camera is the atmosphere.
- Science
The Sun's surface is about 5,778 K, its core around 15 million K, and its corona over a million K. That the thin outer atmosphere is hundreds of times hotter than the surface below it is a genuinely unsolved problem rather than a measurement artefact.
5778 is part of
Factors & digit properties
- Divisors (16)
- 1, 2, 3, 6, 9, 18, 27, 54, 107, 214, 321, 642, 963, 1926, 2889, 5778
- Prime factorisation
- 2 × 3^3 × 107
- Digit sum
- 27
- Digital root
- 9
Representations
- Decimal
- 5778
- Scientific notation
- 5.778 × 10^3
Roman numerals
Roman numerals as modelled here goes up to 3,999.
Binary
1 0 1 1 0 1 0 0 1 0 0 1 0
1 × 4,096 + 0 × 2,048 + 1 × 1,024 + 1 × 512 + 0 × 256 + 1 × 128 + 0 × 64 + 0 × 32 + 1 × 16 + 0 × 8 + 0 × 4 + 1 × 2 + 0 × 1 = 5,778
Octal
1 3 2 2 2
1 × 4,096 + 3 × 512 + 2 × 64 + 2 × 8 + 2 × 1 = 5,778
Hexadecimal
1 6 9 2
1 × 4,096 + 6 × 256 + 9 × 16 + 2 × 1 = 5,778
Read as powers of two: 4,096 + 1,024 + 512 + 128 + 16 + 2 = 5,778.
In historical numeral systems
Egyptian
5 lotuses, 7 coils of rope, 7 hobbles, 8 strokes
5 × 1,000 + 7 × 100 + 7 × 10 + 8 × 1 = 5,778. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Systems that simply cannot reach this value are left out. Where a script needs a font most readers do not have, the reading is given instead of the glyphs — see number systems for each system in full.
Other mathematical patterns
- Triangular number
- Abundant number
- Hexagonal number
- Harshad (Niven) number
- Lucas number
Related numbers & connections
The Sun's core is around 15 million kelvin and its visible surface about 5,778. Energy generated at the centre takes a very long time to reach the surface it eventually leaves from.
View 15000000 →Other connections
- contrasts with15000000
why?
Strength 0.50, confidence "high".
Technology & computing
Colour temperature names a light by the temperature of the hot body that would emit it, which is why a photographic 'daylight' setting is quoted in kelvin at all. The Sun's own effective temperature is about 5,778 K, but the light arriving at the ground is bluer — the atmosphere scatters the short wavelengths across the whole sky — so the daylight standards used in photography and display calibration sit higher, around 5,500 to 6,500 K. The gap between the star's temperature and the setting on the camera is the atmosphere.
DocumentedTechnology & computing
Science
The Sun's surface is about 5,778 K, its core around 15 million K, and its corona over a million K. That the thin outer atmosphere is hundreds of times hotter than the surface below it is a genuinely unsolved problem rather than a measurement artefact.
DocumentedScience
Common questions
Is 5778 a prime number?
No, 5778 is not prime.
What are the factors of 5778?
The factors of 5778 are 1, 2, 3, 6, 9, 18, 27, 54, 107, 214, 321, 642, 963, 1926, 2889, 5778.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026