28884128 has 108 divisors (see below), whose sum is σ = 72286830. Its totient is φ = 11321856.

The previous prime is 28884073. The next prime is 28884133. The reversal of 28884128 is 82148882.

It can be written as a sum of positive squares in 3 ways, for example, as 17405584 + 11478544 = 4172^2 + 3388^2 .

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 264938 + ... + 265046.

Almost surely, 2^28884128 is an apocalyptic number.

28884128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28884128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36143415).

28884128 is an abundant number, since it is smaller than the sum of its proper divisors (43402702).

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

28884128 is a wasteful number, since it uses less digits than its factorization.

28884128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 131 counting only the distinct ones).

The product of its digits is 65536, while the sum is 41.

The square root of 28884128 is about 5374.3955939250. The cubic root of 28884128 is about 306.8219461463.

The spelling of 28884128 in words is "twenty-eight million, eight hundred eighty-four thousand, one hundred twenty-eight".