664478332 has 12 divisors (see below), whose sum is σ = 1328956720. Its totient is φ = 284776416.

The previous prime is 664478327. The next prime is 664478377. The reversal of 664478332 is 233874466.

It is a happy number.

664478332 is an admirable number.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 11865657 + ... + 11865712.

Almost surely, 2^664478332 is an apocalyptic number.

It is an amenable number.

664478332 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

664478332 is a wasteful number, since it uses less digits than its factorization.

664478332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23731380 (or 23731378 counting only the distinct ones).

The product of its digits is 580608, while the sum is 43.

The square root of 664478332 is about 25777.4772233436. The cubic root of 664478332 is about 872.6235737649.

The spelling of 664478332 in words is "six hundred sixty-four million, four hundred seventy-eight thousand, three hundred thirty-two".