664328 has 16 divisors (see below), whose sum is σ = 1423680. Its totient is φ = 284688.

The previous prime is 664319. The next prime is 664331. The reversal of 664328 is 823466.

It is a self number, because there is not a number n which added to its sum of digits gives 664328.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5876 + ... + 5987.

It is an arithmetic number, because the mean of its divisors is an integer number (88980).

2⁶⁶⁴³²⁸ is an apocalyptic number.

It is an amenable number.

664328 is an abundant number, since it is smaller than the sum of its proper divisors (759352).

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

664328 is a wasteful number, since it uses less digits than its factorization.

664328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11876 (or 11872 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 664328 is about 815.0631877345. The cubic root of 664328 is about 87.2557761164.

The spelling of 664328 in words is "six hundred sixty-four thousand, three hundred twenty-eight".