640324074 has 32 divisors (see below), whose sum is σ = 1460289600. Its totient is φ = 185432832.

The previous prime is 640324049. The next prime is 640324081. The reversal of 640324074 is 470423046.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 240124 + ... + 242775.

It is an arithmetic number, because the mean of its divisors is an integer number (45634050).

Almost surely, 2^640324074 is an apocalyptic number.

640324074 is an abundant number, since it is smaller than the sum of its proper divisors (819965526).

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

640324074 is a wasteful number, since it uses less digits than its factorization.

640324074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482934.

The product of its (nonzero) digits is 16128, while the sum is 30.

The square root of 640324074 is about 25304.6255455401. The cubic root of 640324074 is about 861.9193090239.

The spelling of 640324074 in words is "six hundred forty million, three hundred twenty-four thousand, seventy-four".