number.wiki
Number

780

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

Abundant Number Harshad / Niven Hexagonal Triangular Year

Properties

Parity
Even
Digit count
3
Digit sum
15
Digital root
6
Palindrome
No
Divisor count
24
σ(n) — sum of divisors
2,352

Primality

Prime factorization: 2 2 × 3 × 5 × 13

Divisors & multiples

All divisors (24)
1 · 2 · 3 · 4 · 5 · 6 · 10 · 12 · 13 · 15 · 20 · 26 · 30 · 39 · 52 · 60 · 65 · 78 · 130 · 156 · 195 · 260 · 390 · 780
Aliquot sum (sum of proper divisors): 1,572
Factor pairs (a × b = 780)
1 × 780
2 × 390
3 × 260
4 × 195
5 × 156
6 × 130
10 × 78
12 × 65
13 × 60
15 × 52
20 × 39
26 × 30
First multiples
780 · 1,560 · 2,340 · 3,120 · 3,900 · 4,680 · 5,460 · 6,240 · 7,020 · 7,800

Representations

In words
seven hundred eighty
Ordinal
780th
Roman numeral
DCCLXXX
Binary
1100001100
Octal
1414
Hexadecimal
30C

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 780, here are decompositions:

  • 7 + 773 = 780
  • 11 + 769 = 780
  • 19 + 761 = 780
  • 23 + 757 = 780
  • 29 + 751 = 780
  • 37 + 743 = 780
  • 41 + 739 = 780
  • 47 + 733 = 780

Showing the first eight; more decompositions exist.

Unicode codepoint
̌
U+030C
Non-spacing mark (Mn)

UTF-8 encoding: CC 8C (2 bytes).

Lookup U+030C on Compart ↗ Lookup on FileFormat.Info ↗
Hex color
#00030C
RGB(0, 3, 12)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.12.