664932 has 12 divisors (see below), whose sum is σ = 1551536. Its totient is φ = 221640.

The previous prime is 664891. The next prime is 664933. The reversal of 664932 is 239466.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 664932.

It is not an unprimeable number, because it can be changed into a prime (664933) by changing a digit.

664932 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27694 + ... + 27717.

2⁶⁶⁴⁹³² is an apocalyptic number.

It is an amenable number.

664932 is an abundant number, since it is smaller than the sum of its proper divisors (886604).

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

664932 is a wasteful number, since it uses less digits than its factorization.

664932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55418 (or 55416 counting only the distinct ones).

The product of its digits is 7776, while the sum is 30.

The square root of 664932 is about 815.4336269740. The cubic root of 664932 is about 87.2822121162.

It can be divided in two parts, 664 and 932, that added together give a triangular number (1596 = T₅₆).

The spelling of 664932 in words is "six hundred sixty-four thousand, nine hundred thirty-two".