321764864 has 20 divisors (see below), whose sum is σ = 642902304. Its totient is φ = 160882176.

The previous prime is 321764837. The next prime is 321764873. The reversal of 321764864 is 468467123.

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 as a sum of consecutive naturals, namely, 313712 + ... + 314735.

Almost surely, 2^321764864 is an apocalyptic number.

It is an amenable number.

321764864 is a deficient number, since it is larger than the sum of its proper divisors (321137440).

321764864 is an frugal number, since it uses more digits than its factorization.

321764864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628465 (or 628449 counting only the distinct ones).

The product of its digits is 193536, while the sum is 41.

The square root of 321764864 is about 17937.8054399082. The cubic root of 321764864 is about 685.2455219477.

The spelling of 321764864 in words is "three hundred twenty-one million, seven hundred sixty-four thousand, eight hundred sixty-four".