28175772 has 12 divisors (see below), whose sum is σ = 65743496. Its totient is φ = 9391920.

The previous prime is 28175731. The next prime is 28175779. The reversal of 28175772 is 27757182.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28175772.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28175779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1173979 + ... + 1174002.

Almost surely, 2^28175772 is an apocalyptic number.

It is an amenable number.

28175772 is an abundant number, since it is smaller than the sum of its proper divisors (37567724).

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

28175772 is a wasteful number, since it uses less digits than its factorization.

28175772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2347988 (or 2347986 counting only the distinct ones).

The product of its digits is 54880, while the sum is 39.

The square root of 28175772 is about 5308.0855305844. The cubic root of 28175772 is about 304.2929856599.

The spelling of 28175772 in words is "twenty-eight million, one hundred seventy-five thousand, seven hundred seventy-two".