624
624 Hektor is the largest Jupiter trojan.
- Even
- Composite
Where 624 fits
Why 624 is special
It is bilobed and has a moon, which together suggest it is two objects that came together gently rather than one that broke.
Factors & digit properties
- Divisors (20)
- 1, 2, 3, 4, 6, 8, 12, 13, 16, 24, 26, 39, 48, 52, 78, 104, 156, 208, 312, 624
- Prime factorisation
- 2^4 × 3 × 13
- Digit sum
- 12
- Digital root
- 3
Representations
- Decimal
- 624
- Scientific notation
- 6.240 × 10^2
Roman numerals
D C X X I V
DCXXIV uses the subtractive pair IV: one before five — five minus one.
Binary
1 0 0 1 1 1 0 0 0 0
1 × 512 + 0 × 256 + 0 × 128 + 1 × 64 + 1 × 32 + 1 × 16 + 0 × 8 + 0 × 4 + 0 × 2 + 0 × 1 = 624
Octal
1 1 6 0
1 × 512 + 1 × 64 + 6 × 8 + 0 × 1 = 624
Hexadecimal
2 7 0
2 × 256 + 7 × 16 + 0 × 1 = 624
Read as powers of two: 512 + 64 + 32 + 16 = 624.
In historical numeral systems
Egyptian
6 coils of rope, 2 hobbles, 4 strokes
6 × 100 + 2 × 10 + 4 × 1 = 624. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 corner wedge (sixties place), 2 corner wedges + 4 vertical wedges (units place)
10 × 60 + 24 = 624. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
chi, then kappa, then delta, marked as a numeral
chi-kappa-delta + keraia
chi + kappa + delta written in descending order and added — the letters carry their values wherever they stand, so this is addition, not place value.
Hebrew numerals
tav, then resh, then kaf, then dalet
tav-resh-kaf-dalet
tav (400) + resh (200) + kaf (20) + dalet (4) = 624, written in descending order.
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 largest trojan and a binary trojan, both probably assembled gently rather than broken apart.
View 617 →The leading and trailing swarms are named for Greek and Trojan figures respectively.
View 1172 →Science
624 Hektor is the largest Jupiter trojan at roughly 250 kilometres, with an elongated bilobed shape and a small satellite, consistent with a contact binary origin.
DocumentedSciencePeriod: 1907–
Common questions
Is 624 a prime number?
No, 624 is not prime.
What are the factors of 624?
The factors of 624 are 1, 2, 3, 4, 6, 8, 12, 13, 16, 24, 26, 39, 48, 52, 78, 104, 156, 208, 312, 624.
What is 624 in Roman numerals?
624 in Roman numerals is DCXXIV. IV is subtractive: one before five — five minus one. Written additively it would be DCXXIIII, which Roman inscriptions used freely — the strict subtractive form is a later convention.
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