28166886 has 32 divisors (see below), whose sum is σ = 68284800. Its totient is φ = 8535240.

The previous prime is 28166869. The next prime is 28166891. The reversal of 28166886 is 68866182.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23116 + ... + 24303.

It is an arithmetic number, because the mean of its divisors is an integer number (2133900).

Almost surely, 2^28166886 is an apocalyptic number.

28166886 is an abundant number, since it is smaller than the sum of its proper divisors (40117914).

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

28166886 is a wasteful number, since it uses less digits than its factorization.

28166886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47441 (or 47435 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

The square root of 28166886 is about 5307.2484396342. The cubic root of 28166886 is about 304.2609932590.

The spelling of 28166886 in words is "twenty-eight million, one hundred sixty-six thousand, eight hundred eighty-six".