664232928 has 24 divisors (see below), whose sum is σ = 1743611688. Its totient is φ = 221410944.

The previous prime is 664232927. The next prime is 664232953. The reversal of 664232928 is 829232466.

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 664232928.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664232927) 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, 3459451 + ... + 3459642.

It is an arithmetic number, because the mean of its divisors is an integer number (72650487).

Almost surely, 2^664232928 is an apocalyptic number.

It is an amenable number.

664232928 is an abundant number, since it is smaller than the sum of its proper divisors (1079378760).

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

664232928 is a wasteful number, since it uses less digits than its factorization.

664232928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6919106 (or 6919098 counting only the distinct ones).

The product of its digits is 248832, while the sum is 42.

The square root of 664232928 is about 25772.7167368906. The cubic root of 664232928 is about 872.5161352560.

The spelling of 664232928 in words is "six hundred sixty-four million, two hundred thirty-two thousand, nine hundred twenty-eight".