321680928 has 24 divisors (see below), whose sum is σ = 844412688. Its totient is φ = 107226944.

The previous prime is 321680917. The next prime is 321680939. The reversal of 321680928 is 829086123.

It is a happy number.

321680928 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (321680917) and next prime (321680939).

It is a tau number, because it is divible by the number of its divisors (24).

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1675326 + ... + 1675517.

It is an arithmetic number, because the mean of its divisors is an integer number (35183862).

Almost surely, 2^321680928 is an apocalyptic number.

It is an amenable number.

321680928 is an abundant number, since it is smaller than the sum of its proper divisors (522731760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

321680928 is a wasteful number, since it uses less digits than its factorization.

321680928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3350856 (or 3350848 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 321680928 is about 17935.4656477048. The cubic root of 321680928 is about 685.1859320871.

The spelling of 321680928 in words is "three hundred twenty-one million, six hundred eighty thousand, nine hundred twenty-eight".