28108132 has 12 divisors (see below), whose sum is σ = 52973116. Its totient is φ = 12972960.

The previous prime is 28108109. The next prime is 28108177. The reversal of 28108132 is 23180182.

It can be written as a sum of positive squares in 2 ways, for example, as 5125696 + 22982436 = 2264^2 + 4794^2 .

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 28108097 and 28108106.

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, 270219 + ... + 270322.

Almost surely, 2^28108132 is an apocalyptic number.

It is an amenable number.

28108132 is a deficient number, since it is larger than the sum of its proper divisors (24864984).

28108132 is a wasteful number, since it uses less digits than its factorization.

28108132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540558 (or 540556 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 28108132 is about 5301.7102900856. The cubic root of 28108132 is about 304.0492908302.

The spelling of 28108132 in words is "twenty-eight million, one hundred eight thousand, one hundred thirty-two".