320686660 has 24 divisors (see below), whose sum is σ = 769648320. Its totient is φ = 109949664.

The previous prime is 320686651. The next prime is 320686673. The reversal of 320686660 is 66686023.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1145170 + ... + 1145449.

It is an arithmetic number, because the mean of its divisors is an integer number (32068680).

Almost surely, 2^320686660 is an apocalyptic number.

It is an amenable number.

320686660 is an abundant number, since it is smaller than the sum of its proper divisors (448961660).

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

320686660 is a wasteful number, since it uses less digits than its factorization.

320686660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2290635 (or 2290633 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 320686660 is about 17907.7262654978. The cubic root of 320686660 is about 684.4792675175.

The spelling of 320686660 in words is "three hundred twenty million, six hundred eighty-six thousand, six hundred sixty".