320672728 has 32 divisors (see below), whose sum is σ = 646387200. Its totient is φ = 148662432.

The previous prime is 320672719. The next prime is 320672731. The reversal of 320672728 is 827276023.

It is a happy number.

It is a congruent number.

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, 15300 + ... + 29587.

It is an arithmetic number, because the mean of its divisors is an integer number (20199600).

Almost surely, 2^320672728 is an apocalyptic number.

320672728 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

320672728 is an abundant number, since it is smaller than the sum of its proper divisors (325714472).

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

320672728 is a wasteful number, since it uses less digits than its factorization.

320672728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44959 (or 44955 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 320672728 is about 17907.3372671651. The cubic root of 320672728 is about 684.4693551383.

The spelling of 320672728 in words is "three hundred twenty million, six hundred seventy-two thousand, seven hundred twenty-eight".