28989912 has 64 divisors (see below), whose sum is σ = 84775680. Its totient is φ = 8088192.

The previous prime is 28989901. The next prime is 28989931. The reversal of 28989912 is 21998982.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5218 + ... + 9230.

It is an arithmetic number, because the mean of its divisors is an integer number (1324620).

Almost surely, 2^28989912 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 28989912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42387840).

28989912 is an abundant number, since it is smaller than the sum of its proper divisors (55785768).

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

28989912 is a wasteful number, since it uses less digits than its factorization.

28989912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4072 (or 4068 counting only the distinct ones).

The product of its digits is 186624, while the sum is 48.

The square root of 28989912 is about 5384.2280783786. The cubic root of 28989912 is about 307.1960536874.

The spelling of 28989912 in words is "twenty-eight million, nine hundred eighty-nine thousand, nine hundred twelve".