number.wiki
Number

78

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

Abundant Number Sphenic Number Squarefree Triangular Year

Properties

Parity
Even
Digit count
2
Digit sum
15
Digital root
6
Palindrome
No
Divisor count
8
σ(n) — sum of divisors
168

Primality

Prime factorization: 2 × 3 × 13

Divisors & multiples

All divisors (8)
1 · 2 · 3 · 6 · 13 · 26 · 39 · 78
Aliquot sum (sum of proper divisors): 90
Factor pairs (a × b = 78)
1 × 78
2 × 39
3 × 26
6 × 13
First multiples
78 · 156 · 234 · 312 · 390 · 468 · 546 · 624 · 702 · 780

Representations

In words
seventy-eight
Ordinal
78th
Roman numeral
LXXVIII
Binary
1001110
Octal
116
Hexadecimal
4E

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 78, here are decompositions:

  • 5 + 73 = 78
  • 7 + 71 = 78
  • 11 + 67 = 78
  • 17 + 61 = 78
  • 19 + 59 = 78
  • 31 + 47 = 78
  • 37 + 41 = 78
ASCII character

As an ASCII codepoint, 78 is N. Printable ASCII character N.

Hex color
#00004E
RGB(0, 0, 78)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.78.