28188472 has 16 divisors (see below), whose sum is σ = 56919240. Its totient is φ = 13010016.

The previous prime is 28188469. The next prime is 28188497. The reversal of 28188472 is 27488182.

It is a congruent number.

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, 135418 + ... + 135625.

Almost surely, 2^28188472 is an apocalyptic number.

It is an amenable number.

28188472 is an abundant number, since it is smaller than the sum of its proper divisors (28730768).

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

28188472 is a wasteful number, since it uses less digits than its factorization.

28188472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271062 (or 271058 counting only the distinct ones).

The product of its digits is 57344, while the sum is 40.

The square root of 28188472 is about 5309.2816839945. The cubic root of 28188472 is about 304.3386979883.

The spelling of 28188472 in words is "twenty-eight million, one hundred eighty-eight thousand, four hundred seventy-two".