320317988 has 12 divisors (see below), whose sum is σ = 560693532. Its totient is φ = 160119840.

The previous prime is 320317951. The next prime is 320317993. The reversal of 320317988 is 889713023.

It can be written as a sum of positive squares in 2 ways, for example, as 134050084 + 186267904 = 11578^2 + 13648^2 .

It is a super-2 number, since 2×320317988² = 205207226872736288, which contains 22 as substring.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

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, 16406 + ... + 30162.

It is an arithmetic number, because the mean of its divisors is an integer number (46724461).

Almost surely, 2^320317988 is an apocalyptic number.

It is an amenable number.

320317988 is a deficient number, since it is larger than the sum of its proper divisors (240375544).

320317988 is a wasteful number, since it uses less digits than its factorization.

320317988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19582 (or 19580 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 320317988 is about 17897.4296478573. The cubic root of 320317988 is about 684.2168669289.

The spelling of 320317988 in words is "three hundred twenty million, three hundred seventeen thousand, nine hundred eighty-eight".