664388492 has 24 divisors (see below), whose sum is σ = 1273527360. Its totient is φ = 301871360.

The previous prime is 664388453. The next prime is 664388507. The reversal of 664388492 is 294883466.

It is a happy number.

664388492 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 664388492.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166484 + ... + 170427.

It is an arithmetic number, because the mean of its divisors is an integer number (53063640).

Almost surely, 2^664388492 is an apocalyptic number.

It is an amenable number.

664388492 is a deficient number, since it is larger than the sum of its proper divisors (609138868).

664388492 is a wasteful number, since it uses less digits than its factorization.

664388492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336961 (or 336959 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 50.

The square root of 664388492 is about 25775.7345579132. The cubic root of 664388492 is about 872.5842446494.

The spelling of 664388492 in words is "six hundred sixty-four million, three hundred eighty-eight thousand, four hundred ninety-two".