28187688 has 16 divisors (see below), whose sum is σ = 70469280. Its totient is φ = 9395888.

The previous prime is 28187669. The next prime is 28187693. The reversal of 28187688 is 88678182.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 587220 + ... + 587267.

It is an arithmetic number, because the mean of its divisors is an integer number (4404330).

Almost surely, 2^28187688 is an apocalyptic number.

It is an amenable number.

28187688 is an abundant number, since it is smaller than the sum of its proper divisors (42281592).

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

28187688 is a wasteful number, since it uses less digits than its factorization.

28187688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1174496 (or 1174492 counting only the distinct ones).

The product of its digits is 344064, while the sum is 48.

The square root of 28187688 is about 5309.2078505178. The cubic root of 28187688 is about 304.3358764595.

The spelling of 28187688 in words is "twenty-eight million, one hundred eighty-seven thousand, six hundred eighty-eight".