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Number

180

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

Abundant Number Harshad / Niven Year

Properties

Parity
Even
Digit count
3
Digit sum
9
Digital root
9
Palindrome
No
Divisor count
18
σ(n) — sum of divisors
546

Primality

Prime factorization: 2 2 × 3 2 × 5

Divisors & multiples

All divisors (18)
1 · 2 · 3 · 4 · 5 · 6 · 9 · 10 · 12 · 15 · 18 · 20 · 30 · 36 · 45 · 60 · 90 · 180
Aliquot sum (sum of proper divisors): 366
Factor pairs (a × b = 180)
1 × 180
2 × 90
3 × 60
4 × 45
5 × 36
6 × 30
9 × 20
10 × 18
12 × 15
First multiples
180 · 360 · 540 · 720 · 900 · 1,080 · 1,260 · 1,440 · 1,620 · 1,800

Representations

In words
one hundred eighty
Ordinal
180th
Roman numeral
CLXXX
Binary
10110100
Octal
264
Hexadecimal
B4

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 180, here are decompositions:

  • 7 + 173 = 180
  • 13 + 167 = 180
  • 17 + 163 = 180
  • 23 + 157 = 180
  • 29 + 151 = 180
  • 31 + 149 = 180
  • 41 + 139 = 180
  • 43 + 137 = 180

Showing the first eight; more decompositions exist.

Unicode codepoint
´
U+00B4
Modifier symbol (Sk)

UTF-8 encoding: C2 B4 (2 bytes).

Lookup U+00B4 on Compart ↗ Lookup on FileFormat.Info ↗
Hex color
#0000B4
RGB(0, 0, 180)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.180.