720 (number)

720 (seven hundred [and] twenty) is the natural number following 719 and preceding 721.

In mathematics
720 is:
 * 6! (6 factorial).
 * a composite number with 30 divisors, more than any number below, making it a highly composite number.
 * a highly abundant number.
 * a Harshad number in every base from binary to decimal.
 * the smallest number to be palindromic in 16 bases.
 * a 241-gonal number.

720 is expressible as the product of consecutive integers in two different ways: $720 = 1 × 2 × 3 × 4 × 5 × 6$ and $720 = 8 × 9 × 10$.

There are 49 solutions to the equation $φ(x) = 720$, more than any integer below it, making 720 a highly totient number.

In other fields
720 is:
 * A common vertical display resolution for HDTV (see 720p).
 * 720° is two full rotations; the term "720" refers to a skateboarding trick.
 * 720° is also the name of a skateboarding video game.
 * 720 is a dual area code in the Denver Metro Area along with 303.
 * 720° is the sum of all the defects of any polyhedron.
 * 720 is a short form of saying Boeing 720, an airliner which is no longer in service.

For the year AD, see 720.