28521872 has 20 divisors (see below), whose sum is σ = 55465200. Its totient is φ = 14208288.

The previous prime is 28521853. The next prime is 28521881. The reversal of 28521872 is 27812582.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1379 + ... + 7677.

It is an arithmetic number, because the mean of its divisors is an integer number (2773260).

Almost surely, 2^28521872 is an apocalyptic number.

It is an amenable number.

28521872 is a deficient number, since it is larger than the sum of its proper divisors (26943328).

28521872 is a wasteful number, since it uses less digits than its factorization.

28521872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6590 (or 6584 counting only the distinct ones).

The product of its digits is 17920, while the sum is 35.

The square root of 28521872 is about 5340.5872336289. The cubic root of 28521872 is about 305.5338567413.

The spelling of 28521872 in words is "twenty-eight million, five hundred twenty-one thousand, eight hundred seventy-two".