320345720 has 16 divisors (see below), whose sum is σ = 720777960. Its totient is φ = 128138272.

The previous prime is 320345699. The next prime is 320345731. The reversal of 320345720 is 27543023.

It is a self number, because there is not a number n which added to its sum of digits gives 320345720.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4004282 + ... + 4004361.

Almost surely, 2^320345720 is an apocalyptic number.

It is an amenable number.

320345720 is an abundant number, since it is smaller than the sum of its proper divisors (400432240).

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

320345720 is a wasteful number, since it uses less digits than its factorization.

320345720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8008654 (or 8008650 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 26.

The square root of 320345720 is about 17898.2043792108. The cubic root of 320345720 is about 684.2366120523.

Adding to 320345720 its reverse (27543023), we get a palindrome (347888743).

The spelling of 320345720 in words is "three hundred twenty million, three hundred forty-five thousand, seven hundred twenty".