Number
-640
- Negative
- Even
- 3 digits
-640 is an even 3-digit integer and the negative of 640. It has 16 divisors and a digital root of 1.
Number properties
ParityEvendivisible by 2
SignNegative
Absolute value640
Digit count3
Digit sum10
Digital root1repeated digit sum
PalindromicNoreads differently backwards
Factors & divisors
Prime factorisation−1 × 2^7 × 5
Distinct prime factors22, 5
Number of divisors16
Sum of divisors σ(n)1,530
SquarefreeNohas a repeated prime factor
All divisors1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 64016 in total
Arithmetic
Representations
Decimal-640
Binary101000000010 bits
Octal1200
Hexadecimal280
Base 36HS
In wordsminus six hundred and forty
Ordinalminus six hundred and fortieth
Scientific notation-6.4 × 10^2
Engineering notation-640
Powers & multiples
-640 to the power 2409,600
-640 to the power 3-262,144,000
-640 to the power 4167,772,160,000
-640 to the power 5-107,374,182,400,000
First ten multiples-640, -1,280, -1,920, -2,560, -3,200, -3,840, -4,480, -5,120, -5,760, -6,400
Powers of twoBetween 2^9 (512) and 2^10 (1,024)
Divisibility tests
Divisible by 2Yes
Divisible by 3No, remainder 1
Divisible by 4Yes
Divisible by 5Yes
Divisible by 6No, remainder 4
Divisible by 7No, remainder 3
Divisible by 8Yes
Divisible by 9No, remainder 1
Divisible by 10Yes
Divisible by 11No, remainder 2
Divisible by 12No, remainder 4
Divisible by 100No, remainder 40
As a percentage & fraction
As a percentage-64,000%
-640% as a decimal-6.4
-640% of 100-640
-640% of 1,000-6,400
As a fraction of 100-640/100
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