320385560 has 64 divisors (see below), whose sum is σ = 789225120. Its totient is φ = 116085760.

The previous prime is 320385551. The next prime is 320385577. The reversal of 320385560 is 65583023.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138332 + ... + 140628.

Almost surely, 2^320385560 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 320385560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (394612560).

320385560 is an abundant number, since it is smaller than the sum of its proper divisors (468839560).

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

320385560 is a wasteful number, since it uses less digits than its factorization.

320385560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2636 (or 2632 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 320385560 is about 17899.3173054170. The cubic root of 320385560 is about 684.2649760509.

The spelling of 320385560 in words is "three hundred twenty million, three hundred eighty-five thousand, five hundred sixty".