Number
72
72 is a composite number, even, a calendar year.
Properties
- Parity
- Even
- Digit count
- 2
- Digit sum
- 9
- Digital root
- 9
- Palindrome
- No
- Divisor count
- 12
- σ(n) — sum of divisors
- 195
Primality
Prime factorization: 2 3 × 3 2
Divisors & multiples
Aliquot sum (sum of proper divisors):
123
Representations
- In words
- seventy-two
- Ordinal
- 72nd
- Roman numeral
- LXXII
- Binary
- 1001000
- Octal
- 110
- Hexadecimal
- 48
Also seen as
Goldbach decomposition
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 72, here are decompositions:
- 5 + 67 = 72
- 11 + 61 = 72
- 13 + 59 = 72
- 19 + 53 = 72
- 29 + 43 = 72
- 31 + 41 = 72
ASCII character
As an ASCII codepoint, 72 is H. Printable ASCII character H.
Hex color
#000048
RGB(0, 0, 72)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.72.