Number 640

Representations of 640
Greek numeral
χμ
Sanskrit numeral
६४०
Arabic numeral
٦٤٠
Roman numeral
DCXL
Maya numeral
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ↂ
Chinese numeral
六百四十
Hebrew numeral
תרמ
640 in different numeral systems
Binary
1010000000
Base-3
212201
Base-4
22000
Base-5
10030
Base-6
2544
Base-7
1603
Base-8
1200
Duodecimal
454
Hex
280
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 x 2 x 2 x 2 x 2 x 2 x 2 x 5
Characteristics
Difference of 2 squares Harshad Even Composite Abundant
Related primes
Number 640 prime
4751
Prime number before 640
631
Prime number after 640
641