28186028 has 24 divisors (see below), whose sum is σ = 54954480. Its totient is φ = 12559680.

The previous prime is 28186021. The next prime is 28186031. The reversal of 28186028 is 82068182.

It is not an unprimeable number, because it can be changed into a prime (28186021) 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 7 ways as a sum of consecutive naturals, for example, 7838 + ... + 10853.

It is an arithmetic number, because the mean of its divisors is an integer number (2289770).

Almost surely, 2^28186028 is an apocalyptic number.

It is an amenable number.

28186028 is a deficient number, since it is larger than the sum of its proper divisors (26768452).

28186028 is a wasteful number, since it uses less digits than its factorization.

28186028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18737 (or 18735 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 28186028 is about 5309.0515160431. The cubic root of 28186028 is about 304.3299021316.

The spelling of 28186028 in words is "twenty-eight million, one hundred eighty-six thousand, twenty-eight".