320331660 has 48 divisors (see below), whose sum is σ = 978469632. Its totient is φ = 77656000.

The previous prime is 320331631. The next prime is 320331677. The reversal of 320331660 is 66133023.

It is a super-2 number, since 2×320331660² = 205224744796711200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 320331660.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 242016 + ... + 243335.

It is an arithmetic number, because the mean of its divisors is an integer number (20384784).

Almost surely, 2^320331660 is an apocalyptic number.

320331660 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

320331660 is an abundant number, since it is smaller than the sum of its proper divisors (658137972).

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

320331660 is a wasteful number, since it uses less digits than its factorization.

320331660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485374 (or 485372 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 24.

The square root of 320331660 is about 17897.8115980697. The cubic root of 320331660 is about 684.2266015054.

Adding to 320331660 its reverse (66133023), we get a palindrome (386464683).

The spelling of 320331660 in words is "three hundred twenty million, three hundred thirty-one thousand, six hundred sixty".