328720280 has 64 divisors (see below), whose sum is σ = 872570880. Its totient is φ = 109065600.

The previous prime is 328720267. The next prime is 328720331. The reversal of 328720280 is 82027823.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10256 + ... + 27615.

It is an arithmetic number, because the mean of its divisors is an integer number (13633920).

Almost surely, 2^328720280 is an apocalyptic number.

It is an amenable number.

328720280 is an abundant number, since it is smaller than the sum of its proper divisors (543850600).

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

328720280 is a wasteful number, since it uses less digits than its factorization.

328720280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37920 (or 37916 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 328720280 is about 18130.6447761794. The cubic root of 328720280 is about 690.1478924045.

The spelling of 328720280 in words is "three hundred twenty-eight million, seven hundred twenty thousand, two hundred eighty".