28272428 has 24 divisors (see below), whose sum is σ = 54667872. Its totient is φ = 12725504.

The previous prime is 28272401. The next prime is 28272443. The reversal of 28272428 is 82427282.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7475 + ... + 10602.

It is an arithmetic number, because the mean of its divisors is an integer number (2277828).

Almost surely, 2^28272428 is an apocalyptic number.

It is an amenable number.

28272428 is a deficient number, since it is larger than the sum of its proper divisors (26395444).

28272428 is a wasteful number, since it uses less digits than its factorization.

28272428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18121 (or 18119 counting only the distinct ones).

The product of its digits is 28672, while the sum is 35.

The square root of 28272428 is about 5317.1823365388. The cubic root of 28272428 is about 304.6405440135.

The spelling of 28272428 in words is "twenty-eight million, two hundred seventy-two thousand, four hundred twenty-eight".