640001364 has 24 divisors (see below), whose sum is σ = 1495411008. Its totient is φ = 213037440.

The previous prime is 640001359. The next prime is 640001399. The reversal of 640001364 is 463100046.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27957 + ... + 45404.

It is an arithmetic number, because the mean of its divisors is an integer number (62308792).

Almost surely, 2^640001364 is an apocalyptic number.

It is an amenable number.

640001364 is an abundant number, since it is smaller than the sum of its proper divisors (855409644).

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

640001364 is a wasteful number, since it uses less digits than its factorization.

640001364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74095 (or 74093 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 640001364 is about 25298.2482397497. The cubic root of 640001364 is about 861.7744882308.

The spelling of 640001364 in words is "six hundred forty million, one thousand, three hundred sixty-four".