28505088 has 88 divisors (see below), whose sum is σ = 84500160. Its totient is φ = 9492480.

The previous prime is 28505053. The next prime is 28505093. The reversal of 28505088 is 88050582.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 27133 + ... + 28163.

Almost surely, 2^28505088 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 28505088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42250080).

28505088 is an abundant number, since it is smaller than the sum of its proper divisors (55995072).

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

28505088 is a wasteful number, since it uses less digits than its factorization.

28505088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060 (or 1036 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 36.

The square root of 28505088 is about 5339.0156396100. The cubic root of 28505088 is about 305.4739134287.

The spelling of 28505088 in words is "twenty-eight million, five hundred five thousand, eighty-eight".