664644104 has 32 divisors (see below), whose sum is σ = 1325338200. Its totient is φ = 311393280.

The previous prime is 664644091. The next prime is 664644139. The reversal of 664644104 is 401446466.

It can be written as a sum of positive squares in 4 ways, for example, as 576096004 + 88548100 = 24002^2 + 9410^2 .

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, 20474 + ... + 41814.

Almost surely, 2^664644104 is an apocalyptic number.

It is an amenable number.

664644104 is a deficient number, since it is larger than the sum of its proper divisors (660694096).

664644104 is a wasteful number, since it uses less digits than its factorization.

664644104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21593 (or 21589 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 35.

The square root of 664644104 is about 25780.6924654866. The cubic root of 664644104 is about 872.6961342083.

The spelling of 664644104 in words is "six hundred sixty-four million, six hundred forty-four thousand, one hundred four".