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 the 14th 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: <!-- there's a trivial third way: "1" factor can be dropped --> and .
There are 49 solutions to the equation , 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.