28201928 has 16 divisors (see below), whose sum is σ = 55662000. Its totient is φ = 13358736.

The previous prime is 28201919. The next prime is 28201939. The reversal of 28201928 is 82910282.

It is a junction number, because it is equal to n+sod(n) for n = 28201894 and 28201903.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 92618 + ... + 92921.

It is an arithmetic number, because the mean of its divisors is an integer number (3478875).

Almost surely, 2^28201928 is an apocalyptic number.

It is an amenable number.

28201928 is a deficient number, since it is larger than the sum of its proper divisors (27460072).

28201928 is a wasteful number, since it uses less digits than its factorization.

28201928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185564 (or 185560 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 28201928 is about 5310.5487475401. The cubic root of 28201928 is about 304.3871164821.

The spelling of 28201928 in words is "twenty-eight million, two hundred one thousand, nine hundred twenty-eight".