28186768 has 20 divisors (see below), whose sum is σ = 54919228. Its totient is φ = 14014080.

The previous prime is 28186751. The next prime is 28186783. The reversal of 28186768 is 86768182.

It can be written as a sum of positive squares in 2 ways, for example, as 10445824 + 17740944 = 3232^2 + 4212^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1971 + ... + 7762.

Almost surely, 2^28186768 is an apocalyptic number.

It is an amenable number.

28186768 is a deficient number, since it is larger than the sum of its proper divisors (26732460).

28186768 is a wasteful number, since it uses less digits than its factorization.

28186768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9922 (or 9916 counting only the distinct ones).

The product of its digits is 258048, while the sum is 46.

The square root of 28186768 is about 5309.1212078837. The cubic root of 28186768 is about 304.3325654152.

The spelling of 28186768 in words is "twenty-eight million, one hundred eighty-six thousand, seven hundred sixty-eight".