Number 640

Interestingness: 10 · Rank #276 of 1000

Visual representations

Binary image (n×n bits)
2⁷5
Prime factorization

Representations of 640

६४०

●●
▃▃▃▃▃
▃▃▃▃▃
六百四十
𓈖𓈖𓈖𓈖𓈖𓈖
𓎆𓎆𓎆𓎆
-........------

640 in different numeral systems

Binary
1010000000
Base-3
Base-4
Base-5
Base-6
Base-7
Base-8
Duodecimal
Hex
Vigesimal
1c0
Base-24
12g
Base-36
hs
Negabinary
11110000000

Factorization

Prime factors: 2, 5
Divisors: 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640
Sum of divisors other than 640: 890
Product of prime factors: 640 = 2 × 2 × 2 × 2 × 2 × 2 × 2 × 5

Number-theory characteristics (6)

Difference of 2 squares Evil number Refactorable Even Composite Abundant

Base-10 digit properties (2)

These depend on the decimal representation of the number.

Harshad Duck number

Related primes

Number 640 prime
Prime number before 640
Prime number after 640