664889704 has 64 divisors (see below), whose sum is σ = 1348300800. Its totient is φ = 306561024.

The previous prime is 664889663. The next prime is 664889707. The reversal of 664889704 is 407988466.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (664889707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 864232 + ... + 865000.

It is an arithmetic number, because the mean of its divisors is an integer number (21067200).

Almost surely, 2^664889704 is an apocalyptic number.

It is an amenable number.

664889704 is an abundant number, since it is smaller than the sum of its proper divisors (683411096).

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

664889704 is a wasteful number, since it uses less digits than its factorization.

664889704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962 (or 958 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 52.

The square root of 664889704 is about 25785.4552800605. The cubic root of 664889704 is about 872.8036141736.

The spelling of 664889704 in words is "six hundred sixty-four million, eight hundred eighty-nine thousand, seven hundred four".