Number
80
80 is a composite number, even, a calendar year.
Properties
- Parity
- Even
- Digit count
- 2
- Digit sum
- 8
- Digital root
- 8
- Palindrome
- No
- Divisor count
- 10
- σ(n) — sum of divisors
- 186
Primality
Prime factorization: 2 4 × 5
Divisors & multiples
Aliquot sum (sum of proper divisors):
106
Representations
- In words
- eighty
- Ordinal
- 80th
- Roman numeral
- LXXX
- Binary
- 1010000
- Octal
- 120
- Hexadecimal
- 50
Also seen as
Goldbach decomposition
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 80, here are decompositions:
- 7 + 73 = 80
- 13 + 67 = 80
- 19 + 61 = 80
- 37 + 43 = 80
ASCII character
As an ASCII codepoint, 80 is P. Printable ASCII character P.
Network port
TCP/UDP port 80 is the well-known port for HTTP — HyperText Transfer Protocol — the web.
Hex color
#000050
RGB(0, 0, 80)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.80.