664138912 has 24 divisors (see below), whose sum is σ = 1309695156. Its totient is φ = 331517952.

The previous prime is 664138879. The next prime is 664138927. The reversal of 664138912 is 219831466.

664138912 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 663783696 + 355216 = 25764^2 + 596^2 .

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, 2688 + ... + 36544.

Almost surely, 2^664138912 is an apocalyptic number.

It is an amenable number.

664138912 is a deficient number, since it is larger than the sum of its proper divisors (645556244).

664138912 is a wasteful number, since it uses less digits than its factorization.

664138912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34480 (or 34472 counting only the distinct ones).

The product of its digits is 62208, while the sum is 40.

The square root of 664138912 is about 25770.8927280372. The cubic root of 664138912 is about 872.4749677960.

The spelling of 664138912 in words is "six hundred sixty-four million, one hundred thirty-eight thousand, nine hundred twelve".