28108986 has 16 divisors (see below), whose sum is σ = 56311200. Its totient is φ = 9354128.

The previous prime is 28108931. The next prime is 28108991. The reversal of 28108986 is 68980182.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 400 + ... + 7508.

It is an arithmetic number, because the mean of its divisors is an integer number (3519450).

Almost surely, 2^28108986 is an apocalyptic number.

28108986 is an abundant number, since it is smaller than the sum of its proper divisors (28202214).

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

28108986 is a wasteful number, since it uses less digits than its factorization.

28108986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7773.

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 28108986 is about 5301.7908295217. The cubic root of 28108986 is about 304.0523700751.

The spelling of 28108986 in words is "twenty-eight million, one hundred eight thousand, nine hundred eighty-six".