720 (number)
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Seven hundred twenty is the natural number following 719 and preceding 721.
| 720 | |
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| Cardinal | Seven hundred and twenty |
| Ordinal | 720th |
| Factorization | <math>2^4 \cdot 3^2 \cdot 5<math> |
| Roman numeral | DCCXX |
| Binary | 1011010000 |
| Hexadecimal | 2D0 |
It is 6! (6 factorial), a composite number with lots of divisors, 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, making it a highly composite number. It is a Harshad number in every base from binary to decimal.
There are 49 solutions to the equation φ(x) = 720, more than any integer below it, making 720 a highly totient number.
720 is a 241-gonal number.
In other feilds
720 is
See also: seven hundred
For the year AD, see 720.es:Setecientos veinte