Number
816
816 is a composite number, even, a calendar year.
Properties
- Parity
- Even
- Digit count
- 3
- Digit sum
- 15
- Digital root
- 6
- Palindrome
- No
- Divisor count
- 20
- σ(n) — sum of divisors
- 2,232
Primality
Prime factorization: 2 4 × 3 × 17
Divisors & multiples
All divisors (20)
Aliquot sum (sum of proper divisors):
1,416
Factor pairs (a × b = 816)
Representations
- In words
- eight hundred sixteen
- Ordinal
- 816th
- Roman numeral
- DCCCXVI
- Binary
- 1100110000
- Octal
- 1460
- Hexadecimal
- 330
Also seen as
Goldbach decomposition
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 816, here are decompositions:
- 5 + 811 = 816
- 7 + 809 = 816
- 19 + 797 = 816
- 29 + 787 = 816
- 43 + 773 = 816
- 47 + 769 = 816
- 59 + 757 = 816
- 73 + 743 = 816
Showing the first eight; more decompositions exist.
Unicode codepoint
̰
U+0330
Non-spacing mark (Mn)
UTF-8 encoding: CC B0 (2 bytes).
Hex color
#000330
RGB(0, 3, 48)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.48.