28105172 has 24 divisors (see below), whose sum is σ = 52581312. Its totient is φ = 13112000.

The previous prime is 28105157. The next prime is 28105183. The reversal of 28105172 is 27150182.

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, 47 + ... + 7497.

It is an arithmetic number, because the mean of its divisors is an integer number (2190888).

Almost surely, 2^28105172 is an apocalyptic number.

It is an amenable number.

28105172 is a deficient number, since it is larger than the sum of its proper divisors (24476140).

28105172 is a wasteful number, since it uses less digits than its factorization.

28105172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7519 (or 7517 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 28105172 is about 5301.4311275353. The cubic root of 28105172 is about 304.0386175549.

The spelling of 28105172 in words is "twenty-eight million, one hundred five thousand, one hundred seventy-two".