320916728 has 16 divisors (see below), whose sum is σ = 656420760. Its totient is φ = 145871200.

The previous prime is 320916703. The next prime is 320916737. The reversal of 320916728 is 827619023.

It is a junction number, because it is equal to n+sod(n) for n = 320916691 and 320916700.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1823303 + ... + 1823478.

Almost surely, 2^320916728 is an apocalyptic number.

It is an amenable number.

320916728 is an abundant number, since it is smaller than the sum of its proper divisors (335504032).

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

320916728 is a wasteful number, since it uses less digits than its factorization.

320916728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3646798 (or 3646794 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 320916728 is about 17914.1488215321. The cubic root of 320916728 is about 684.6429154555.

The spelling of 320916728 in words is "three hundred twenty million, nine hundred sixteen thousand, seven hundred twenty-eight".