28540172 has 24 divisors (see below), whose sum is σ = 51965760. Its totient is φ = 13703040.

The previous prime is 28540163. The next prime is 28540189. The reversal of 28540172 is 27104582.

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, 10472 + ... + 12912.

It is an arithmetic number, because the mean of its divisors is an integer number (2165240).

Almost surely, 2^28540172 is an apocalyptic number.

It is an amenable number.

28540172 is a deficient number, since it is larger than the sum of its proper divisors (23425588).

28540172 is a wasteful number, since it uses less digits than its factorization.

28540172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2561 (or 2559 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 28540172 is about 5342.3002536361. The cubic root of 28540172 is about 305.5991875886.

The spelling of 28540172 in words is "twenty-eight million, five hundred forty thousand, one hundred seventy-two".