Number

864

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

Abundant Number Achilles Number Harshad / Niven Powerful Number Year

Properties

Parity: Even
Digit count: 3
Digit sum: 18
Digital root: 9
Palindrome: No
Divisor count: 24
σ(n) — sum of divisors: 2,520

Primality

Prime factorization: 2 ⁵ × 3 ³

Divisors & multiples

All divisors (24)

1 · 2 · 3 · 4 · 6 · 8 · 9 · 12 · 16 · 18 · 24 · 27 · 32 · 36 · 48 · 54 · 72 · 96 · 108 · 144 · 216 · 288 · 432 · 864

Aliquot sum (sum of proper divisors): 1,656

Factor pairs (a × b = 864)

1 × 864

2 × 432

3 × 288

4 × 216

6 × 144

8 × 108

9 × 96

12 × 72

16 × 54

18 × 48

24 × 36

27 × 32

First multiples

864 · 1,728 · 2,592 · 3,456 · 4,320 · 5,184 · 6,048 · 6,912 · 7,776 · 8,640

Representations

In words: eight hundred sixty-four
Ordinal: 864th
Roman numeral: DCCCLXIV
Binary: 1101100000
Octal: 1540
Hexadecimal: 360

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 864, here are decompositions:

5 + 859 = 864
7 + 857 = 864
11 + 853 = 864
37 + 827 = 864
41 + 823 = 864
43 + 821 = 864
53 + 811 = 864
67 + 797 = 864

Showing the first eight; more decompositions exist.

Unicode codepoint

U+0360

Non-spacing mark (Mn)

UTF-8 encoding: CD A0 (2 bytes).

Lookup U+0360 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#000360

RGB(0, 3, 96)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.96.

Possible US bank routing number

This passes the ABA routing number checksum and matches the Federal Reserve numbering scheme.

Routing number

000000864

Federal Reserve

United States Government

Banks operate many routing numbers per state and division; an unmatched checksum-valid number can still be a real RTN at a smaller institution.

Look up 000000864 on FedACH ↗ Routing Number Lookup (Wise) ↗