number.wiki
Number

8

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

Deficient Number Fibonacci Harshad / Niven Narcissistic / Armstrong Octagonal Perfect Cube Power of Two Powerful Number Strobogrammatic Year

Properties

Parity
Even
Digit count
1
Digit sum
8
Digital root
8
Palindrome
Yes
Divisor count
4
σ(n) — sum of divisors
15

Primality

Prime factorization: 2 3

Divisors & multiples

All divisors (4)
1 · 2 · 4 · 8
Aliquot sum (sum of proper divisors): 7
Factor pairs (a × b = 8)
1 × 8
2 × 4
First multiples
8 · 16 · 24 · 32 · 40 · 48 · 56 · 64 · 72 · 80

Representations

In words
eight
Ordinal
8th
Roman numeral
VIII
Binary
1000
Octal
10
Hexadecimal
8

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 8, here are decompositions:

  • 3 + 5 = 8
ASCII character

As an ASCII codepoint, 8 is BS (backspace). ASCII control character.

Hex color
#000008
RGB(0, 0, 8)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.8.