28506028 has 6 divisors (see below), whose sum is σ = 49885556. Its totient is φ = 14253012.

The previous prime is 28506013. The next prime is 28506041. The reversal of 28506028 is 82060582.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3563250 + ... + 3563257.

Almost surely, 2^28506028 is an apocalyptic number.

It is an amenable number.

28506028 is a deficient number, since it is larger than the sum of its proper divisors (21379528).

28506028 is a wasteful number, since it uses less digits than its factorization.

28506028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7126511 (or 7126509 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 28506028 is about 5339.1036700929. The cubic root of 28506028 is about 305.4772712190.

The spelling of 28506028 in words is "twenty-eight million, five hundred six thousand, twenty-eight".