28190188 has 12 divisors (see below), whose sum is σ = 53127760. Its totient is φ = 13010832.

The previous prime is 28190179. The next prime is 28190209. The reversal of 28190188 is 88109182.

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, 271008 + ... + 271111.

Almost surely, 2^28190188 is an apocalyptic number.

It is an amenable number.

28190188 is a deficient number, since it is larger than the sum of its proper divisors (24937572).

28190188 is a wasteful number, since it uses less digits than its factorization.

28190188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542136 (or 542134 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 37.

The square root of 28190188 is about 5309.4432853172. The cubic root of 28190188 is about 304.3448734987.

The spelling of 28190188 in words is "twenty-eight million, one hundred ninety thousand, one hundred eighty-eight".