28357872 has 40 divisors (see below), whose sum is σ = 74270544. Its totient is φ = 9321984.

The previous prime is 28357867. The next prime is 28357883. The reversal of 28357872 is 27875382.

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, 543 + ... + 7550.

Almost surely, 2^28357872 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 28357872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37135272).

28357872 is an abundant number, since it is smaller than the sum of its proper divisors (45912672).

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

28357872 is a wasteful number, since it uses less digits than its factorization.

28357872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8177 (or 8171 counting only the distinct ones).

The product of its digits is 188160, while the sum is 42.

The square root of 28357872 is about 5325.2109817358. The cubic root of 28357872 is about 304.9471269093.

The spelling of 28357872 in words is "twenty-eight million, three hundred fifty-seven thousand, eight hundred seventy-two".