28168986 has 8 divisors (see below), whose sum is σ = 56337984. Its totient is φ = 9389660.

The previous prime is 28168967. The next prime is 28168991. The reversal of 28168986 is 68986182.

It is a sphenic number, since it is the product of 3 distinct primes.

28168986 is an admirable number.

It is a Curzon 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, 2347410 + ... + 2347421.

It is an arithmetic number, because the mean of its divisors is an integer number (7042248).

Almost surely, 2^28168986 is an apocalyptic number.

28168986 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28168986 is a wasteful number, since it uses less digits than its factorization.

28168986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4694836.

The product of its digits is 331776, while the sum is 48.

The square root of 28168986 is about 5307.4462785788. The cubic root of 28168986 is about 304.2685545280.

The spelling of 28168986 in words is "twenty-eight million, one hundred sixty-eight thousand, nine hundred eighty-six".