321637664 has 12 divisors (see below), whose sum is σ = 633224214. Its totient is φ = 160818816.

The previous prime is 321637601. The next prime is 321637703. The reversal of 321637664 is 466736123.

It can be written as a sum of positive squares in only one way, i.e., 320410000 + 1227664 = 17900^2 + 1108^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5025557 + ... + 5025620.

Almost surely, 2^321637664 is an apocalyptic number.

It is an amenable number.

321637664 is a deficient number, since it is larger than the sum of its proper divisors (311586550).

321637664 is a wasteful number, since it uses less digits than its factorization.

321637664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10051187 (or 10051179 counting only the distinct ones).

The product of its digits is 108864, while the sum is 38.

The square root of 321637664 is about 17934.2595052040. The cubic root of 321637664 is about 685.1552130208.

The spelling of 321637664 in words is "three hundred twenty-one million, six hundred thirty-seven thousand, six hundred sixty-four".