320572728 has 160 divisors (see below), whose sum is σ = 1061992800. Its totient is φ = 88397568.

The previous prime is 320572717. The next prime is 320572729. The reversal of 320572728 is 827275023.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 320572692 and 320572701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320572729) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 130326 + ... + 132762.

It is an arithmetic number, because the mean of its divisors is an integer number (6637455).

Almost surely, 2^320572728 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 320572728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (530996400).

320572728 is an abundant number, since it is smaller than the sum of its proper divisors (741420072).

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

320572728 is a wasteful number, since it uses less digits than its factorization.

320572728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2491 (or 2478 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The square root of 320572728 is about 17904.5448978744. The cubic root of 320572728 is about 684.3981984255.

The spelling of 320572728 in words is "three hundred twenty million, five hundred seventy-two thousand, seven hundred twenty-eight".