28056186 has 32 divisors (see below), whose sum is σ = 63529920. Its totient is φ = 9174672.

The previous prime is 28056143. The next prime is 28056187. The reversal of 28056186 is 68165082.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28056186.

It is not an unprimeable number, because it can be changed into a prime (28056187) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2040 + ... + 7763.

It is an arithmetic number, because the mean of its divisors is an integer number (1985310).

Almost surely, 2^28056186 is an apocalyptic number.

28056186 is an abundant number, since it is smaller than the sum of its proper divisors (35473734).

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

28056186 is a wasteful number, since it uses less digits than its factorization.

28056186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9867 (or 9861 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 28056186 is about 5296.8090394123. The cubic root of 28056186 is about 303.8618731337.

The spelling of 28056186 in words is "twenty-eight million, fifty-six thousand, one hundred eighty-six".