320664144 has 40 divisors (see below), whose sum is σ = 840754720. Its totient is φ = 105291648.

The previous prime is 320664143. The next prime is 320664161. The reversal of 320664144 is 441466023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320664143) by changing a digit.

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, 46639 + ... + 53070.

It is an arithmetic number, because the mean of its divisors is an integer number (21018868).

Almost surely, 2^320664144 is an apocalyptic number.

It is an amenable number.

320664144 is an abundant number, since it is smaller than the sum of its proper divisors (520090576).

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

320664144 is a wasteful number, since it uses less digits than its factorization.

320664144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99787 (or 99781 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 320664144 is about 17907.0975872697. The cubic root of 320664144 is about 684.4632476266.

The spelling of 320664144 in words is "three hundred twenty million, six hundred sixty-four thousand, one hundred forty-four".