664567608 has 16 divisors (see below), whose sum is σ = 1661419080. Its totient is φ = 221522528.

The previous prime is 664567601. The next prime is 664567613. The reversal of 664567608 is 806765466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664567601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13845135 + ... + 13845182.

Almost surely, 2^664567608 is an apocalyptic number.

It is an amenable number.

664567608 is an abundant number, since it is smaller than the sum of its proper divisors (996851472).

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

664567608 is a wasteful number, since it uses less digits than its factorization.

664567608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27690326 (or 27690322 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 48.

The square root of 664567608 is about 25779.2088319250. The cubic root of 664567608 is about 872.6626524676.

The spelling of 664567608 in words is "six hundred sixty-four million, five hundred sixty-seven thousand, six hundred eight".