number.wiki
Number

64

64 is a composite number, even, a calendar year.

Deficient Number Perfect Cube Perfect Square Power of Two Powerful Number Year

Properties

Parity
Even
Digit count
2
Digit sum
10
Digital root
1
Palindrome
No
Divisor count
7
σ(n) — sum of divisors
127

Primality

Prime factorization: 2 6

Divisors & multiples

All divisors (7)
1 · 2 · 4 · 8 · 16 · 32 · 64
Aliquot sum (sum of proper divisors): 63
Factor pairs (a × b = 64)
1 × 64
2 × 32
4 × 16
8 × 8
First multiples
64 · 128 · 192 · 256 · 320 · 384 · 448 · 512 · 576 · 640

Representations

In words
sixty-four
Ordinal
64th
Roman numeral
LXIV
Binary
1000000
Octal
100
Hexadecimal
40

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 64, here are decompositions:

  • 3 + 61 = 64
  • 5 + 59 = 64
  • 11 + 53 = 64
  • 17 + 47 = 64
  • 23 + 41 = 64
ASCII character

As an ASCII codepoint, 64 is @. Printable ASCII character @.

Hex color
#000040
RGB(0, 0, 64)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.64.