28168988 has 12 divisors (see below), whose sum is σ = 50628312. Its totient is φ = 13703760.

The previous prime is 28168967. The next prime is 28168991. The reversal of 28168988 is 88986182.

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, 95018 + ... + 95313.

It is an arithmetic number, because the mean of its divisors is an integer number (4219026).

Almost surely, 2^28168988 is an apocalyptic number.

It is an amenable number.

28168988 is a deficient number, since it is larger than the sum of its proper divisors (22459324).

28168988 is a wasteful number, since it uses less digits than its factorization.

28168988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190372 (or 190370 counting only the distinct ones).

The product of its digits is 442368, while the sum is 50.

The square root of 28168988 is about 5307.4464669933. The cubic root of 28168988 is about 304.2685617291.

The spelling of 28168988 in words is "twenty-eight million, one hundred sixty-eight thousand, nine hundred eighty-eight".