28875636 has 48 divisors (see below), whose sum is σ = 75358080. Its totient is φ = 9561600.

The previous prime is 28875599. The next prime is 28875641. The reversal of 28875636 is 63657882.

28875636 is a `hidden beast` number, since 2 + 8 + 8 + 7 + 5 + 636 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 28875591 and 28875600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17236 + ... + 18836.

It is an arithmetic number, because the mean of its divisors is an integer number (1569960).

Almost surely, 2^28875636 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 28875636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37679040).

28875636 is an abundant number, since it is smaller than the sum of its proper divisors (46482444).

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

28875636 is a wasteful number, since it uses less digits than its factorization.

28875636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1781 (or 1773 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 28875636 is about 5373.6054935211. The cubic root of 28875636 is about 306.7918744133.

The spelling of 28875636 in words is "twenty-eight million, eight hundred seventy-five thousand, six hundred thirty-six".