320738028 has 96 divisors (see below), whose sum is σ = 861020160. Its totient is φ = 92171520.

The previous prime is 320738009. The next prime is 320738053. The reversal of 320738028 is 820837023.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 320738028.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 139101 + ... + 141387.

It is an arithmetic number, because the mean of its divisors is an integer number (8968960).

Almost surely, 2^320738028 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 320738028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (430510080).

320738028 is an abundant number, since it is smaller than the sum of its proper divisors (540282132).

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

320738028 is a wasteful number, since it uses less digits than its factorization.

320738028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2367 (or 2365 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 320738028 is about 17909.1604493343. The cubic root of 320738028 is about 684.5158124882.

The spelling of 320738028 in words is "three hundred twenty million, seven hundred thirty-eight thousand, twenty-eight".