28090928 has 20 divisors (see below), whose sum is σ = 54968208. Its totient is φ = 13905600.

The previous prime is 28090897. The next prime is 28090963. The reversal of 28090928 is 82909082.

It is a junction number, because it is equal to n+sod(n) for n = 28090891 and 28090900.

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, 7076 + ... + 10307.

Almost surely, 2^28090928 is an apocalyptic number.

It is an amenable number.

28090928 is a deficient number, since it is larger than the sum of its proper divisors (26877280).

28090928 is a wasteful number, since it uses less digits than its factorization.

28090928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17492 (or 17486 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 28090928 is about 5300.0875464468. The cubic root of 28090928 is about 303.9872455406.

The spelling of 28090928 in words is "twenty-eight million, ninety thousand, nine hundred twenty-eight".