320664560 has 20 divisors (see below), whose sum is σ = 745545288. Its totient is φ = 128265792.

The previous prime is 320664517. The next prime is 320664569. The reversal of 320664560 is 65466023.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320664569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2004074 + ... + 2004233.

Almost surely, 2^320664560 is an apocalyptic number.

It is an amenable number.

320664560 is an abundant number, since it is smaller than the sum of its proper divisors (424880728).

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

320664560 is a wasteful number, since it uses less digits than its factorization.

320664560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4008320 (or 4008314 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 320664560 is about 17907.1092027720. The cubic root of 320664560 is about 684.4635436129.

The spelling of 320664560 in words is "three hundred twenty million, six hundred sixty-four thousand, five hundred sixty".