640951600 has 30 divisors (see below), whose sum is σ = 1539887180. Its totient is φ = 256380480.

The previous prime is 640951579. The next prime is 640951609. The reversal of 640951600 is 6159046.

It is not an unprimeable number, because it can be changed into a prime (640951609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 800790 + ... + 801589.

Almost surely, 2^640951600 is an apocalyptic number.

It is an amenable number.

640951600 is an abundant number, since it is smaller than the sum of its proper divisors (898935580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640951600 is a wasteful number, since it uses less digits than its factorization.

640951600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1602397 (or 1602386 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 640951600 is about 25317.0219417687. The cubic root of 640951600 is about 862.2007811750.

The spelling of 640951600 in words is "six hundred forty million, nine hundred fifty-one thousand, six hundred".