28874688 has 56 divisors (see below), whose sum is σ = 77205840. Its totient is φ = 9523200.

The previous prime is 28874663. The next prime is 28874707. The reversal of 28874688 is 88647882.

It is a self number, because there is not a number n which added to its sum of digits gives 28874688.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18648 + ... + 20136.

Almost surely, 2^28874688 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 28874688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38602920).

28874688 is an abundant number, since it is smaller than the sum of its proper divisors (48331152).

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

28874688 is a wasteful number, since it uses less digits than its factorization.

28874688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1605 (or 1595 counting only the distinct ones).

The product of its digits is 1376256, while the sum is 51.

The square root of 28874688 is about 5373.5172838654. The cubic root of 28874688 is about 306.7885170052.

The spelling of 28874688 in words is "twenty-eight million, eight hundred seventy-four thousand, six hundred eighty-eight".