28255128 has 128 divisors (see below), whose sum is σ = 83635200. Its totient is φ = 7862400.

The previous prime is 28255127. The next prime is 28255141. The reversal of 28255128 is 82155282.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28255127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 215623 + ... + 215753.

It is an arithmetic number, because the mean of its divisors is an integer number (653400).

Almost surely, 2^28255128 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 28255128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41817600).

28255128 is an abundant number, since it is smaller than the sum of its proper divisors (55380072).

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

28255128 is a wasteful number, since it uses less digits than its factorization.

28255128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213 (or 209 counting only the distinct ones).

The product of its digits is 12800, while the sum is 33.

The square root of 28255128 is about 5315.5552861390. Note that the first 3 decimals coincide. The cubic root of 28255128 is about 304.5783944551.

The spelling of 28255128 in words is "twenty-eight million, two hundred fifty-five thousand, one hundred twenty-eight".