320664642 has 16 divisors (see below), whose sum is σ = 679054752. Its totient is φ = 100600640.

The previous prime is 320664623. The next prime is 320664679. The reversal of 320664642 is 246466023.

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 7 ways as a sum of consecutive naturals, for example, 1571784 + ... + 1571987.

It is an arithmetic number, because the mean of its divisors is an integer number (42440922).

Almost surely, 2^320664642 is an apocalyptic number.

320664642 is an abundant number, since it is smaller than the sum of its proper divisors (358390110).

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

320664642 is a wasteful number, since it uses less digits than its factorization.

320664642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3143793.

The product of its (nonzero) digits is 41472, while the sum is 33.

The square root of 320664642 is about 17907.1114923653. Note that the first 3 decimals coincide. The cubic root of 320664642 is about 684.4636019563.

The spelling of 320664642 in words is "three hundred twenty million, six hundred sixty-four thousand, six hundred forty-two".