321663604 has 12 divisors (see below), whose sum is σ = 564834564. Its totient is φ = 160282304.

The previous prime is 321663593. The next prime is 321663611. The reversal of 321663604 is 406366123.

It can be written as a sum of positive squares in 2 ways, for example, as 282576100 + 39087504 = 16810^2 + 6252^2 .

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 136057 + ... + 138400.

It is an arithmetic number, because the mean of its divisors is an integer number (47069547).

Almost surely, 2^321663604 is an apocalyptic number.

It is an amenable number.

321663604 is a deficient number, since it is larger than the sum of its proper divisors (243170960).

321663604 is a wasteful number, since it uses less digits than its factorization.

321663604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274754 (or 274752 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 321663604 is about 17934.9826874742. The cubic root of 321663604 is about 685.1736317266.

The spelling of 321663604 in words is "three hundred twenty-one million, six hundred sixty-three thousand, six hundred four".