28988874 has 32 divisors (see below), whose sum is σ = 65335680. Its totient is φ = 9525600.

The previous prime is 28988873. The next prime is 28988879. The reversal of 28988874 is 47888982.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 28988874.

It is not an unprimeable number, because it can be changed into a prime (28988873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54 + ... + 7614.

It is an arithmetic number, because the mean of its divisors is an integer number (2041740).

Almost surely, 2^28988874 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28988874, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32667840).

28988874 is an abundant number, since it is smaller than the sum of its proper divisors (36346806).

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

28988874 is a wasteful number, since it uses less digits than its factorization.

28988874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7643 (or 7637 counting only the distinct ones).

The product of its digits is 2064384, while the sum is 54.

The square root of 28988874 is about 5384.1316848680. The cubic root of 28988874 is about 307.1923872015.

The spelling of 28988874 in words is "twenty-eight million, nine hundred eighty-eight thousand, eight hundred seventy-four".