28173128 has 16 divisors (see below), whose sum is σ = 53419500. Its totient is φ = 13927936.

The previous prime is 28173113. The next prime is 28173133. The reversal of 28173128 is 82137182.

It can be written as a sum of positive squares in 2 ways, for example, as 27857284 + 315844 = 5278^2 + 562^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28173094 and 28173103.

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, 19073 + ... + 20496.

Almost surely, 2^28173128 is an apocalyptic number.

It is an amenable number.

28173128 is a deficient number, since it is larger than the sum of its proper divisors (25246372).

28173128 is a wasteful number, since it uses less digits than its factorization.

28173128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39664 (or 39660 counting only the distinct ones).

The product of its digits is 5376, while the sum is 32.

The square root of 28173128 is about 5307.8364707289. The cubic root of 28173128 is about 304.2834671295.

The spelling of 28173128 in words is "twenty-eight million, one hundred seventy-three thousand, one hundred twenty-eight".