321686368 has 24 divisors (see below), whose sum is σ = 637215768. Its totient is φ = 159853824.

The previous prime is 321686329. The next prime is 321686371. The reversal of 321686368 is 863686123.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 25621 + ... + 36052.

It is an arithmetic number, because the mean of its divisors is an integer number (26550657).

Almost surely, 2^321686368 is an apocalyptic number.

It is an amenable number.

321686368 is a deficient number, since it is larger than the sum of its proper divisors (315529400).

321686368 is a wasteful number, since it uses less digits than its factorization.

321686368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61846 (or 61838 counting only the distinct ones).

The product of its digits is 248832, while the sum is 43.

The square root of 321686368 is about 17935.6173018940. The cubic root of 321686368 is about 685.1897944966.

The spelling of 321686368 in words is "three hundred twenty-one million, six hundred eighty-six thousand, three hundred sixty-eight".