664044404 has 12 divisors (see below), whose sum is σ = 1163324484. Its totient is φ = 331665984.

The previous prime is 664044391. The next prime is 664044421. The reversal of 664044404 is 404440466.

It can be written as a sum of positive squares in 2 ways, for example, as 193154404 + 470890000 = 13898^2 + 21700^2 .

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, 84839 + ... + 92334.

It is an arithmetic number, because the mean of its divisors is an integer number (96943707).

Almost surely, 2^664044404 is an apocalyptic number.

It is an amenable number.

664044404 is a deficient number, since it is larger than the sum of its proper divisors (499280080).

664044404 is a wasteful number, since it uses less digits than its factorization.

664044404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178114 (or 178112 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 32.

The square root of 664044404 is about 25769.0590437447. The cubic root of 664044404 is about 872.4335809846.

The spelling of 664044404 in words is "six hundred sixty-four million, forty-four thousand, four hundred four".