664382504 has 8 divisors (see below), whose sum is σ = 1245717210. Its totient is φ = 332191248.

The previous prime is 664382503. The next prime is 664382513. The reversal of 664382504 is 405283466.

It can be written as a sum of positive squares in only one way, i.e., 424442404 + 239940100 = 20602^2 + 15490^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×664382504² = 882808223242620032, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664382501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41523899 + ... + 41523914.

Almost surely, 2^664382504 is an apocalyptic number.

It is an amenable number.

664382504 is a deficient number, since it is larger than the sum of its proper divisors (581334706).

664382504 is a wasteful number, since it uses less digits than its factorization.

664382504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83047819 (or 83047815 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 38.

The square root of 664382504 is about 25775.6184018929. The cubic root of 664382504 is about 872.5816231660.

The spelling of 664382504 in words is "six hundred sixty-four million, three hundred eighty-two thousand, five hundred four".