28205886 has 32 divisors (see below), whose sum is σ = 58053888. Its totient is φ = 9132480.

The previous prime is 28205857. The next prime is 28205897. The reversal of 28205886 is 68850282.

It is a Smith number, since the sum of its digits (39) 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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30645 + ... + 31551.

It is an arithmetic number, because the mean of its divisors is an integer number (1814184).

Almost surely, 2^28205886 is an apocalyptic number.

28205886 is an abundant number, since it is smaller than the sum of its proper divisors (29848002).

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

28205886 is a wasteful number, since it uses less digits than its factorization.

28205886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056.

The product of its (nonzero) digits is 61440, while the sum is 39.

The square root of 28205886 is about 5310.9213889870. The cubic root of 28205886 is about 304.4013555541.

The spelling of 28205886 in words is "twenty-eight million, two hundred five thousand, eight hundred eighty-six".