664513808 has 40 divisors (see below), whose sum is σ = 1472822400. Its totient is φ = 284520960.

The previous prime is 664513757. The next prime is 664513819. The reversal of 664513808 is 808315466.

664513808 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 154568 + ... + 158808.

It is an arithmetic number, because the mean of its divisors is an integer number (36820560).

Almost surely, 2^664513808 is an apocalyptic number.

It is an amenable number.

664513808 is an abundant number, since it is smaller than the sum of its proper divisors (808308592).

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

664513808 is a wasteful number, since it uses less digits than its factorization.

664513808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5655 (or 5649 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 664513808 is about 25778.1653342514. The cubic root of 664513808 is about 872.6391030614.

The spelling of 664513808 in words is "six hundred sixty-four million, five hundred thirteen thousand, eight hundred eight".