28286132 has 36 divisors (see below), whose sum is σ = 57901284. Its totient is φ = 12055680.

The previous prime is 28286129. The next prime is 28286143. The reversal of 28286132 is 23168282.

It can be written as a sum of positive squares in 2 ways, for example, as 6421156 + 21864976 = 2534^2 + 4676^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54032 + ... + 54552.

It is an arithmetic number, because the mean of its divisors is an integer number (1608369).

Almost surely, 2^28286132 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28286132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28950642).

28286132 is an abundant number, since it is smaller than the sum of its proper divisors (29615152).

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

28286132 is a wasteful number, since it uses less digits than its factorization.

28286132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816 (or 807 counting only the distinct ones).

The product of its digits is 9216, while the sum is 32.

The square root of 28286132 is about 5318.4708328616. The cubic root of 28286132 is about 304.6897570922.

The spelling of 28286132 in words is "twenty-eight million, two hundred eighty-six thousand, one hundred thirty-two".