28128132 has 144 divisors (see below), whose sum is σ = 82555200. Its totient is φ = 8017920.

The previous prime is 28128109. The next prime is 28128161. The reversal of 28128132 is 23182182.

It is a junction number, because it is equal to n+sod(n) for n = 28128096 and 28128105.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 476719 + ... + 476777.

It is an arithmetic number, because the mean of its divisors is an integer number (573300).

Almost surely, 2^28128132 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 28128132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41277600).

28128132 is an abundant number, since it is smaller than the sum of its proper divisors (54427068).

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

28128132 is a wasteful number, since it uses less digits than its factorization.

28128132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146 (or 141 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 28128132 is about 5303.5961384706. The cubic root of 28128132 is about 304.1213879266.

The spelling of 28128132 in words is "twenty-eight million, one hundred twenty-eight thousand, one hundred thirty-two".