720 (number)

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(Redirected from Seven hundred twenty)
← 719 720 721 →
Cardinalseven hundred twenty
Ordinal720th
(seven hundred twentieth)
Factorization24 × 32 × 5
Divisors1, 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
Greek numeralΨΚ´
Roman numeralDCCXX
Binary10110100002
Ternary2222003
Senary32006
Octal13208
Duodecimal50012
Hexadecimal2D016

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

It is 6! (6 factorial) and a composite number with 30 divisors, more than any number below, making it a highly composite number.[1] It is a Harshad number in every base from binary to decimal.

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. [2]

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 fields[edit]

720 is:

For the year AD, see 720.

References[edit]

  1. ^ "Sloane's A002182 : Highly composite numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-31.
  2. ^ Wells, David (1987). The Penguin Dictionary of Curious and Interesting Numbers. London: Penguin Books. p. 719.