28173928 has 16 divisors (see below), whose sum is σ = 53496000. Its totient is φ = 13908336.

The previous prime is 28173923. The next prime is 28173931. The reversal of 28173928 is 82937182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28173923) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21658 + ... + 22921.

It is an arithmetic number, because the mean of its divisors is an integer number (3343500).

Almost surely, 2^28173928 is an apocalyptic number.

It is an amenable number.

28173928 is a deficient number, since it is larger than the sum of its proper divisors (25322072).

28173928 is a wasteful number, since it uses less digits than its factorization.

28173928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44664 (or 44660 counting only the distinct ones).

The product of its digits is 48384, while the sum is 40.

The square root of 28173928 is about 5307.9118304659. The cubic root of 28173928 is about 304.2863472318.

The spelling of 28173928 in words is "twenty-eight million, one hundred seventy-three thousand, nine hundred twenty-eight".