7800
The Atari 7800 was designed to be compatible with the 2600.
- Even
- Composite
Where 7800 fits
Why 7800 is special
It was finished in 1984, shelved during the company's sale, and released in 1986 into a market Nintendo had already taken.
Factors & digit properties
- Divisors (48)
- 1, 2, 3, 4, 5, 6, 8, 10, 12, 13, 15, 20, 24, 25, 26, 30, 39, 40, 50, 52, 60, 65, 75, 78, 100, 104, 120, 130, 150, 156, 195, 200, 260, 300, 312, 325, 390, 520, 600, 650, 780, 975, 1300, 1560, 1950, 2600, 3900, 7800
- Prime factorisation
- 2^3 × 3 × 5^2 × 13
- Digit sum
- 15
- Digital root
- 6
Representations
- Decimal
- 7800
- Scientific notation
- 7.800 × 10^3
Roman numerals
Roman numerals as modelled here goes up to 3,999.
Binary
1 1 1 1 0 0 1 1 1 1 0 0 0
1 × 4,096 + 1 × 2,048 + 1 × 1,024 + 1 × 512 + 0 × 256 + 0 × 128 + 1 × 64 + 1 × 32 + 1 × 16 + 1 × 8 + 0 × 4 + 0 × 2 + 0 × 1 = 7,800
Octal
1 7 1 7 0
1 × 4,096 + 7 × 512 + 1 × 64 + 7 × 8 + 0 × 1 = 7,800
Hexadecimal
1 e 7 8
1 × 4,096 + e × 256 + 7 × 16 + 8 × 1 = 7,800
Read as powers of two: 4,096 + 2,048 + 1,024 + 512 + 64 + 32 + 16 + 8 = 7,800.
In historical numeral systems
Egyptian
7 lotuses, 8 coils of rope
7 × 1,000 + 8 × 100 = 7,800. 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
- Abundant number
- Harshad (Niven) number
Related numbers & connections
The 7800 retained 2600 cartridge compatibility and was shelved for two years during Atari's sale.
View 2600 →Media & popular culture
The Atari 7800 ProSystem retained compatibility with 2600 cartridges and used a custom graphics processor. Its release was delayed by the sale of Atari's consumer division, by which time competitors were established.
DocumentedMedia & popular cultureGeography: United StatesPeriod: 1986
Common questions
Is 7800 a prime number?
No, 7800 is not prime.
What are the factors of 7800?
The factors of 7800 are 1, 2, 3, 4, 5, 6, 8, 10, 12, 13, 15, 20, 24, 25, 26, 30, 39, 40, 50, 52, 60, 65, 75, 78, 100, 104, 120, 130, 150, 156, 195, 200, 260, 300, 312, 325, 390, 520, 600, 650, 780, 975, 1300, 1560, 1950, 2600, 3900, 7800.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 15 July 2026