321604256 has 12 divisors (see below), whose sum is σ = 633158442. Its totient is φ = 160802112.

The previous prime is 321604253. The next prime is 321604277. The reversal of 321604256 is 652406123.

321604256 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 312723856 + 8880400 = 17684^2 + 2980^2 .

It is not an unprimeable number, because it can be changed into a prime (321604253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5025035 + ... + 5025098.

Almost surely, 2^321604256 is an apocalyptic number.

It is an amenable number.

321604256 is a deficient number, since it is larger than the sum of its proper divisors (311554186).

321604256 is a wasteful number, since it uses less digits than its factorization.

321604256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10050143 (or 10050135 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 321604256 is about 17933.3280793053. The cubic root of 321604256 is about 685.1314902001.

The spelling of 321604256 in words is "three hundred twenty-one million, six hundred four thousand, two hundred fifty-six".