28389632 has 36 divisors (see below), whose sum is σ = 58008720. Its totient is φ = 13859328.

The previous prime is 28389631. The next prime is 28389701. The reversal of 28389632 is 23698382.

It is a self number, because there is not a number n which added to its sum of digits gives 28389632.

It is not an unprimeable number, because it can be changed into a prime (28389631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9719 + ... + 12297.

Almost surely, 2^28389632 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 28389632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29004360).

28389632 is an abundant number, since it is smaller than the sum of its proper divisors (29619088).

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

28389632 is an equidigital number, since it uses as much as digits as its factorization.

28389632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2638 (or 2624 counting only the distinct ones).

The product of its digits is 124416, while the sum is 41.

The square root of 28389632 is about 5328.1921887259. The cubic root of 28389632 is about 305.0609284352.

The spelling of 28389632 in words is "twenty-eight million, three hundred eighty-nine thousand, six hundred thirty-two".