720 (number)
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Seven hundred twenty is the natural number following 719 and preceding 721.
|
720 |
|
|---|---|
| Cardinal | Seven hundred and twenty |
| Ordinal | 720th |
| Factorization |  |
| Roman numeral | DCCXX |
| Binary | 1011010000 |
| Hexadecimal | 2D0 |
It is 6! (6 factorial), a composite number with thirty divisors, more than any number below, 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.
[edit] 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
[edit] Factors
2, 2, 2, 2, 3, 3, 5
[edit] In other fields
720 is
- A common vertical resolution for HDTV (see 720i and 720p).
- 720 and above is a good credit score.
- 720 degrees equal two rotations; used as a skateboarding trick.
- 720 is a dual area code in the Denver Metro Area along with 303.
For the year AD, see 720.
