640476100 has 36 divisors (see below), whose sum is σ = 1516184208. Its totient is φ = 232900000.

The previous prime is 640476091. The next prime is 640476121. The reversal of 640476100 is 1674046.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 290026 + ... + 292225.

It is an arithmetic number, because the mean of its divisors is an integer number (42116228).

Almost surely, 2^640476100 is an apocalyptic number.

It is an amenable number.

640476100 is an abundant number, since it is smaller than the sum of its proper divisors (875708108).

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

640476100 is a wasteful number, since it uses less digits than its factorization.

640476100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582276 (or 582269 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 640476100 is about 25307.6292844668. The cubic root of 640476100 is about 861.9875160363.

The spelling of 640476100 in words is "six hundred forty million, four hundred seventy-six thousand, one hundred".