664435564 has 24 divisors (see below), whose sum is σ = 1259460720. Its totient is φ = 304885824.

The previous prime is 664435549. The next prime is 664435579. The reversal of 664435564 is 465534466.

It is an interprime number because it is at equal distance from previous prime (664435549) and next prime (664435579).

It is a self number, because there is not a number n which added to its sum of digits gives 664435564.

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, 27934 + ... + 45925.

It is an arithmetic number, because the mean of its divisors is an integer number (52477530).

Almost surely, 2^664435564 is an apocalyptic number.

It is an amenable number.

664435564 is a deficient number, since it is larger than the sum of its proper divisors (595025156).

664435564 is a wasteful number, since it uses less digits than its factorization.

664435564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74049 (or 74047 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 43.

The square root of 664435564 is about 25776.6476485985. The cubic root of 664435564 is about 872.6048517269.

The spelling of 664435564 in words is "six hundred sixty-four million, four hundred thirty-five thousand, five hundred sixty-four".