664672004 has 6 divisors (see below), whose sum is σ = 1163176014. Its totient is φ = 332336000.

The previous prime is 664671991. The next prime is 664672031. The reversal of 664672004 is 400276466.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 424360000 + 240312004 = 20600^2 + 15502^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83083997 + ... + 83084004.

It is an arithmetic number, because the mean of its divisors is an integer number (193862669).

Almost surely, 2^664672004 is an apocalyptic number.

It is an amenable number.

664672004 is a deficient number, since it is larger than the sum of its proper divisors (498504010).

664672004 is a wasteful number, since it uses less digits than its factorization.

664672004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166168005 (or 166168003 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 35.

The square root of 664672004 is about 25781.2335624190. The cubic root of 664672004 is about 872.7083451953.

The spelling of 664672004 in words is "six hundred sixty-four million, six hundred seventy-two thousand, four".