28163232 has 36 divisors (see below), whose sum is σ = 80090010. Its totient is φ = 9387648.

The previous prime is 28163197. The next prime is 28163243. The reversal of 28163232 is 23236182.

28163232 is a `hidden beast` number, since 28 + 1 + 632 + 3 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 23853456 + 4309776 = 4884^2 + 2076^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a nude number because it is divisible by every one of its digits.

28163232 is a modest number, since divided by 3232 gives 2816 as remainder.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 28163196 and 28163205.

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 5 ways as a sum of consecutive naturals, for example, 48607 + ... + 49182.

Almost surely, 2^28163232 is an apocalyptic number.

It is an amenable number.

28163232 is an abundant number, since it is smaller than the sum of its proper divisors (51926778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28163232 is a wasteful number, since it uses less digits than its factorization.

28163232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97805 (or 97794 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 28163232 is about 5306.9041822893. The cubic root of 28163232 is about 304.2478357550.

The spelling of 28163232 in words is "twenty-eight million, one hundred sixty-three thousand, two hundred thirty-two".