28581888 has 56 divisors (see below), whose sum is σ = 76279248. Its totient is φ = 9519104.

The previous prime is 28581829. The next prime is 28581911. The reversal of 28581888 is 88818582.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23995 + ... + 25157.

Almost surely, 2^28581888 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 28581888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38139624).

28581888 is an abundant number, since it is smaller than the sum of its proper divisors (47697360).

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

28581888 is an equidigital number, since it uses as much as digits as its factorization.

28581888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192 (or 1168 counting only the distinct ones).

The product of its digits is 327680, while the sum is 48.

The square root of 28581888 is about 5346.2031386770. The cubic root of 28581888 is about 305.7480090404.

The spelling of 28581888 in words is "twenty-eight million, five hundred eighty-one thousand, eight hundred eighty-eight".