6357
Earth's polar radius is about 6,357 km.
- Odd
- Composite
Where 6357 fits
Why 6357 is special
The 21 km difference from the equatorial radius is the rotational bulge, and it is why satellite orbits drift predictably and have to be corrected. Navigation systems model the shape as an ellipsoid rather than a sphere for exactly this reason.
Same number, different meanings
How 6357 is understood across different contexts — never implying one meaning because of another.
- Mathematics
The 21 km difference from the equatorial radius is the rotational bulge, and it is why satellite orbits drift predictably and have to be corrected. Navigation systems model the shape as an ellipsoid rather than a sphere for exactly this reason.
- Science
NGC 6357 contains Pismis 24, a cluster whose brightest member was once thought to be the most massive star known before it resolved into multiple stars.
- Geography
At about 6,357 km the polar radius is 21 km shorter than the equatorial one, and satellite navigation models Earth as an ellipsoid rather than a sphere precisely because that difference is far too large to ignore over global distances.
Factors & digit properties
- Divisors (8)
- 1, 3, 13, 39, 163, 489, 2119, 6357
- Prime factorisation
- 3 × 13 × 163
- Digit sum
- 21
- Digital root
- 3
Representations
- Decimal
- 6357
- Scientific notation
- 6.357 × 10^3
Roman numerals
Roman numerals as modelled here goes up to 3,999.
Binary
1 1 0 0 0 1 1 0 1 0 1 0 1
1 × 4,096 + 1 × 2,048 + 0 × 1,024 + 0 × 512 + 0 × 256 + 1 × 128 + 1 × 64 + 0 × 32 + 1 × 16 + 0 × 8 + 1 × 4 + 0 × 2 + 1 × 1 = 6,357
Octal
1 4 3 2 5
1 × 4,096 + 4 × 512 + 3 × 64 + 2 × 8 + 5 × 1 = 6,357
Hexadecimal
1 8 d 5
1 × 4,096 + 8 × 256 + d × 16 + 5 × 1 = 6,357
Read as powers of two: 4,096 + 2,048 + 128 + 64 + 16 + 4 + 1 = 6,357.
In historical numeral systems
Egyptian
6 lotuses, 3 coils of rope, 5 hobbles, 7 strokes
6 × 1,000 + 3 × 100 + 5 × 10 + 7 × 1 = 6,357. 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
- Deficient number
Related numbers & connections
Earth's polar and equatorial radii differ by about 21 km because the planet spins. Navigation systems model the shape as an ellipsoid for exactly this reason.
View 6378 →Other connections
- contrasts with6378
why?
Strength 0.50, confidence "high".
Science
NGC 6357 contains Pismis 24, a cluster whose brightest member was once thought to be the most massive star known before it resolved into multiple stars.
DocumentedSciencePeriod: 1837–
Geography
At about 6,357 km the polar radius is 21 km shorter than the equatorial one, and satellite navigation models Earth as an ellipsoid rather than a sphere precisely because that difference is far too large to ignore over global distances.
DocumentedGeography
Common questions
Is 6357 a prime number?
No, 6357 is not prime.
What are the factors of 6357?
The factors of 6357 are 1, 3, 13, 39, 163, 489, 2119, 6357.
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