321889328 has 20 divisors (see below), whose sum is σ = 645167040. Its totient is φ = 155394624.

The previous prime is 321889283. The next prime is 321889343. The reversal of 321889328 is 823988123.

It is a super-2 number, since 2×321889328² = 207225478960583168, which contains 22 as substring.

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, 346400 + ... + 347327.

It is an arithmetic number, because the mean of its divisors is an integer number (32258352).

Almost surely, 2^321889328 is an apocalyptic number.

It is an amenable number.

321889328 is an abundant number, since it is smaller than the sum of its proper divisors (323277712).

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

321889328 is a wasteful number, since it uses less digits than its factorization.

321889328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693764 (or 693758 counting only the distinct ones).

The product of its digits is 165888, while the sum is 44.

The square root of 321889328 is about 17941.2744251906. The cubic root of 321889328 is about 685.3338653453. Note that the first 3 decimals are identical.

The spelling of 321889328 in words is "three hundred twenty-one million, eight hundred eighty-nine thousand, three hundred twenty-eight".