Properties of the number

Number length
Sum of digits
Multiplication of digits
0
Multiplication of digits not including zero
of 640 = 6.4
Parity
Even
Is a prime number?
No
Next prime number
Is a composite number?
Yes
Is a semiprime number?
No
Is a linear number?
No
Is a square pyramidal number?
No
Triangular number
(T640)Is an abundant number?
Yes
Is a Fibonacci number?
No
Is a Harshad number?
(Niven number)Yes
Count of divisors
Sum of divisors
Factoring
(prime factors)27 × 5
Inverse number
0.0015625
Exponentiation
2 409600 3 262144000 4 167772160000 5 107374182400000 6 68719476736000000 7 43980465111040000000 8 28147497671065600000000 9 18014398509481984000000000 10 11529215046068469760000000000
2√ 25.298221281347 3√ 8.6177387601275 4√ 5.0297337187317 5√ 3.6411284060522 6√ 2.9355985352441 7√ 2.5169979012837 8√ 2.2427067839403 9√ 2.0502072969138 10√ 1.9081741026573 1.7993152895699
Square root and remainder
252 + 15
Is a perfect square?
No
Is a perfect cube?
No
Natural logarithm
(loge)6.4614681763537
Common logarithm
(log10)2.8061799739839
Binary logarithm
(log2)9.3219280948874