664555936 has 48 divisors (see below), whose sum is σ = 1457688960. Its totient is φ = 295636480.

The previous prime is 664555919. The next prime is 664556059. The reversal of 664555936 is 639555466.

It is a self number, because there is not a number n which added to its sum of digits gives 664555936.

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, 3541 + ... + 36628.

It is an arithmetic number, because the mean of its divisors is an integer number (30368520).

Almost surely, 2^664555936 is an apocalyptic number.

It is an amenable number.

664555936 is an abundant number, since it is smaller than the sum of its proper divisors (793133024).

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

664555936 is a wasteful number, since it uses less digits than its factorization.

664555936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40237 (or 40229 counting only the distinct ones).

The product of its digits is 2916000, while the sum is 49.

The square root of 664555936 is about 25778.9824469470. The cubic root of 664555936 is about 872.6575434925.

The spelling of 664555936 in words is "six hundred sixty-four million, five hundred fifty-five thousand, nine hundred thirty-six".