28171332 has 36 divisors (see below), whose sum is σ = 81384576. Its totient is φ = 8048880.

The previous prime is 28171327. The next prime is 28171333. The reversal of 28171332 is 23317182.

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

It is a junction number, because it is equal to n+sod(n) for n = 28171296 and 28171305.

It is not an unprimeable number, because it can be changed into a prime (28171333) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 55644 + ... + 56147.

Almost surely, 2^28171332 is an apocalyptic number.

It is an amenable number.

28171332 is an abundant number, since it is smaller than the sum of its proper divisors (53213244).

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

28171332 is a wasteful number, since it uses less digits than its factorization.

28171332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111808 (or 111803 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 28171332 is about 5307.6672842219. The cubic root of 28171332 is about 304.2770011013.

The spelling of 28171332 in words is "twenty-eight million, one hundred seventy-one thousand, three hundred thirty-two".