640676576 has 24 divisors (see below), whose sum is σ = 1270415160. Its totient is φ = 318031488.

The previous prime is 640676567. The next prime is 640676581. The reversal of 640676576 is 675676046.

It is a self number, because there is not a number n which added to its sum of digits gives 640676576.

It is a congruent number.

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, 67571 + ... + 76466.

It is an arithmetic number, because the mean of its divisors is an integer number (52933965).

Almost surely, 2^640676576 is an apocalyptic number.

It is an amenable number.

640676576 is a deficient number, since it is larger than the sum of its proper divisors (629738584).

640676576 is a wasteful number, since it uses less digits than its factorization.

640676576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144186 (or 144178 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 47.

The square root of 640676576 is about 25311.5897564732. The cubic root of 640676576 is about 862.0774438166.

The spelling of 640676576 in words is "six hundred forty million, six hundred seventy-six thousand, five hundred seventy-six".