720
720 is 6 factorial, and the number of degrees in two full turns.
- Even
- Composite
Where 720 fits
Why 720 is special
720 is where a rotation stops being a direction and becomes a trick. In skateboarding and freestyle skiing a 720 is two complete revolutions, and the naming convention only works because 360 was already understood as one. It is also 6! — the number of ways six objects can be arranged — and the sum of the interior angles of any hexagon.
Factors & digit properties
- Divisors (30)
- 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 30, 36, 40, 45, 48, 60, 72, 80, 90, 120, 144, 180, 240, 360, 720
- Prime factorisation
- 2^4 × 3^2 × 5
- Digit sum
- 9
- Digital root
- 9
Representations
- Decimal
- 720
- Scientific notation
- 7.200 × 10^2
Roman numerals
D C C X X
Binary
1 0 1 1 0 1 0 0 0 0
1 × 512 + 0 × 256 + 1 × 128 + 1 × 64 + 0 × 32 + 1 × 16 + 0 × 8 + 0 × 4 + 0 × 2 + 0 × 1 = 720
Octal
1 3 2 0
1 × 512 + 3 × 64 + 2 × 8 + 0 × 1 = 720
Hexadecimal
2 d 0
2 × 256 + d × 16 + 0 × 1 = 720
Read as powers of two: 512 + 128 + 64 + 16 = 720.
In historical numeral systems
Egyptian
7 coils of rope, 2 hobbles
7 × 100 + 2 × 10 = 720. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 corner wedge + 2 vertical wedges (sixties place), empty units place
12 × 60 + 0 = 720. Places are separated by a space on the tablet, with the higher place written first. The second place is empty, and this is precisely the case the early system could not write unambiguously — the same wedges alone would also read as 1.
Greek (Ionic)
psi, then kappa, marked as a numeral
psi-kappa + keraia
psi + kappa 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 shin, then kaf
tav-shin-kaf
tav (400) + shin (300) + kaf (20) = 720, 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
- Factorial number
- Highly composite number
- Harshad (Niven) number
Related numbers & connections
Two full turns. Aerial sports name tricks in degrees, so a 720 is two rotations and a 1080 three — a naming system borrowed wholesale from geometry rather than invented for sport.
View 360 →Consecutive factorials, 6! and 7!. Each is the number of ways to arrange that many distinct objects, and the jump between them — 720 to 5,040 — is the point where factorial growth starts to feel unreasonable.
View 5040 →Sport
Aerial tricks are named in degrees, so a 720 is two complete revolutions and a 1080 is three. The convention only makes sense because 360 was already the shared vocabulary for a full turn — the sports borrowed a geometric unit rather than inventing a counting system, which is why the numbers get large quickly.
DocumentedSport
Common questions
Is 720 a prime number?
No, 720 is not prime.
What are the factors of 720?
The factors of 720 are 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 30, 36, 40, 45, 48, 60, 72, 80, 90, 120, 144, 180, 240, 360, 720.
What is 720 in Roman numerals?
720 in Roman numerals is DCCXX.
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