640365364 has 24 divisors (see below), whose sum is σ = 1168123040. Its totient is φ = 306874656.

The previous prime is 640365359. The next prime is 640365433. The reversal of 640365364 is 463563046.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22374 + ... + 42205.

Almost surely, 2^640365364 is an apocalyptic number.

It is an amenable number.

640365364 is a deficient number, since it is larger than the sum of its proper divisors (527757676).

640365364 is a wasteful number, since it uses less digits than its factorization.

640365364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64687 (or 64685 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 37.

The square root of 640365364 is about 25305.4413911317. The cubic root of 640365364 is about 861.9378349989.

The spelling of 640365364 in words is "six hundred forty million, three hundred sixty-five thousand, three hundred sixty-four".