28517172 has 24 divisors (see below), whose sum is σ = 66661056. Its totient is φ = 9488448.

The previous prime is 28517161. The next prime is 28517173. The reversal of 28517172 is 27171582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28517173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5928 + ... + 9600.

It is an arithmetic number, because the mean of its divisors is an integer number (2777544).

Almost surely, 2^28517172 is an apocalyptic number.

It is an amenable number.

28517172 is an abundant number, since it is smaller than the sum of its proper divisors (38143884).

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

28517172 is a wasteful number, since it uses less digits than its factorization.

28517172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4327 (or 4325 counting only the distinct ones).

The product of its digits is 7840, while the sum is 33.

The square root of 28517172 is about 5340.1471889827. The cubic root of 28517172 is about 305.5170732706.

The spelling of 28517172 in words is "twenty-eight million, five hundred seventeen thousand, one hundred seventy-two".