640288364 has 12 divisors (see below), whose sum is σ = 1134688800. Its totient is φ = 316091568.

The previous prime is 640288343. The next prime is 640288373. The reversal of 640288364 is 463882046.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1012799 + ... + 1013430.

It is an arithmetic number, because the mean of its divisors is an integer number (94557400).

Almost surely, 2^640288364 is an apocalyptic number.

It is an amenable number.

640288364 is a deficient number, since it is larger than the sum of its proper divisors (494400436).

640288364 is a wasteful number, since it uses less digits than its factorization.

640288364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2026312 (or 2026310 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 41.

The square root of 640288364 is about 25303.9199334807. The cubic root of 640288364 is about 861.9032860380.

The spelling of 640288364 in words is "six hundred forty million, two hundred eighty-eight thousand, three hundred sixty-four".