Number

720

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

Abundant Number Factorial Harshad / Niven Year

Properties

Parity: Even
Digit count: 3
Digit sum: 9
Digital root: 9
Palindrome: No
Divisor count: 30
σ(n) — sum of divisors: 2,418

Primality

Prime factorization: 2 ⁴ × 3 ² × 5

Divisors & multiples

All divisors (30)

1 · 2 · 3 · 4 · 5 · 6 · 8 · 9 · 10 · 12 · 15 · 16 · 18 · 20 · 24 · 30 · 36 · 40 · 45 · 48 · 60 · 72 · 80 · 90 · 120 · 144 · 180 · 240 · 360 · 720

Aliquot sum (sum of proper divisors): 1,698

Factor pairs (a × b = 720)

1 × 720

2 × 360

3 × 240

4 × 180

5 × 144

6 × 120

8 × 90

9 × 80

10 × 72

12 × 60

15 × 48

16 × 45

18 × 40

20 × 36

24 × 30

First multiples

720 · 1,440 · 2,160 · 2,880 · 3,600 · 4,320 · 5,040 · 5,760 · 6,480 · 7,200

Representations

In words: seven hundred twenty
Ordinal: 720th
Roman numeral: DCCXX
Binary: 1011010000
Octal: 1320
Hexadecimal: 2D0

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 720, here are decompositions:

11 + 709 = 720
19 + 701 = 720
29 + 691 = 720
37 + 683 = 720
43 + 677 = 720
47 + 673 = 720
59 + 661 = 720
61 + 659 = 720

Showing the first eight; more decompositions exist.

Unicode codepoint

U+02D0

Modifier letter (Lm)

UTF-8 encoding: CB 90 (2 bytes).

Lookup U+02D0 on Compart ↗ Lookup on FileFormat.Info ↗

Code page identifier

Code page 720 is DOS Arabic — DOS code page for Arabic.

Code pages are integer identifiers used by Windows and other systems to refer to specific character encodings.

Microsoft code page reference ↗

Hex color

#0002D0

RGB(0, 2, 208)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.2.208.