28189086 has 8 divisors (see below), whose sum is σ = 56378184. Its totient is φ = 9396360.

The previous prime is 28189069. The next prime is 28189151. The reversal of 28189086 is 68098182.

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

28189086 is an admirable number.

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 a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2349085 + ... + 2349096.

It is an arithmetic number, because the mean of its divisors is an integer number (7047273).

Almost surely, 2^28189086 is an apocalyptic number.

28189086 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.

28189086 is a wasteful number, since it uses less digits than its factorization.

28189086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4698186.

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

The square root of 28189086 is about 5309.3395069443. The cubic root of 28189086 is about 304.3409076694.

The spelling of 28189086 in words is "twenty-eight million, one hundred eighty-nine thousand, eighty-six".