2560
2560 BC is the approximate completion date of the Great Pyramid.
- Even
- Composite
Where 2560 fits
Why 2560 is special
It was the tallest structure on Earth for about 3,800 years. Contemporary evidence including workers' villages and payment records indicates a paid, organised workforce rather than slaves.
Factors & digit properties
- Divisors (20)
- 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 512, 640, 1280, 2560
- Prime factorisation
- 2^9 × 5
- Digit sum
- 13
- Digital root
- 4
Representations
- Decimal
- 2560
- Scientific notation
- 2.560 × 10^3
Roman numerals
M M D L X
Binary
1 0 1 0 0 0 0 0 0 0 0 0
1 × 2,048 + 0 × 1,024 + 1 × 512 + 0 × 256 + 0 × 128 + 0 × 64 + 0 × 32 + 0 × 16 + 0 × 8 + 0 × 4 + 0 × 2 + 0 × 1 = 2,560
Octal
5 0 0 0
5 × 512 + 0 × 64 + 0 × 8 + 0 × 1 = 2,560
Hexadecimal
a 0 0
a × 256 + 0 × 16 + 0 × 1 = 2,560
Read as powers of two: 2,048 + 512 = 2,560.
In historical numeral systems
Egyptian
2 lotuses, 5 coils of rope, 6 hobbles
2 × 1,000 + 5 × 100 + 6 × 10 = 2,560. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
4 corner wedges + 2 vertical wedges (sixties place), 4 corner wedges (units place)
42 × 60 + 40 = 2560. Places are separated by a space on the tablet, with the higher place written first.
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
Related numbers & connections
The Great Pyramid was the tallest structure on Earth for about 3,800 years, until the nineteenth century. The Eiffel Tower of 1889 is among the structures that finally exceeded it.
View 1889 →Other connections
- is associated with1889
why?
Strength 0.50, confidence "high".
History
Excavated workers' settlements, bakeries and medical care at Giza indicate an organised paid workforce. The slave narrative comes from Herodotus writing two thousand years later and from later retellings.
DocumentedHistoryGeography: EgyptPeriod: around 2560 BC
Common questions
Is 2560 a prime number?
No, 2560 is not prime.
What are the factors of 2560?
The factors of 2560 are 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 512, 640, 1280, 2560.
What is 2560 in Roman numerals?
2560 in Roman numerals is MMDLX.
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