28528432 has 40 divisors (see below), whose sum is σ = 57674880. Its totient is φ = 13655040.

The previous prime is 28528427. The next prime is 28528433. The reversal of 28528432 is 23482582.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28528433) 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 7 ways as a sum of consecutive naturals, for example, 55794 + ... + 56302.

It is an arithmetic number, because the mean of its divisors is an integer number (1441872).

Almost surely, 2^28528432 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 28528432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28837440).

28528432 is an abundant number, since it is smaller than the sum of its proper divisors (29146448).

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

28528432 is a wasteful number, since it uses less digits than its factorization.

28528432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661 (or 655 counting only the distinct ones).

The product of its digits is 30720, while the sum is 34.

The square root of 28528432 is about 5341.2013629894. The cubic root of 28528432 is about 305.5572790989.

The spelling of 28528432 in words is "twenty-eight million, five hundred twenty-eight thousand, four hundred thirty-two".