28875565638 has 16 divisors (see below), whose sum is σ = 64167923760. Its totient is φ = 9625188528.

The previous prime is 28875565637. The next prime is 28875565651. The reversal of 28875565638 is 83656557882.

28875565638 is a `hidden beast` number, since 2 + 8 + 8 + 7 + 5 + 565 + 63 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28875565633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 267366295 + ... + 267366402.

It is an arithmetic number, because the mean of its divisors is an integer number (4010495235).

Almost surely, 2^28875565638 is an apocalyptic number.

28875565638 is an abundant number, since it is smaller than the sum of its proper divisors (35292358122).

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

28875565638 is a wasteful number, since it uses less digits than its factorization.

28875565638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534732708 (or 534732702 counting only the distinct ones).

The product of its digits is 96768000, while the sum is 63.

The spelling of 28875565638 in words is "twenty-eight billion, eight hundred seventy-five million, five hundred sixty-five thousand, six hundred thirty-eight".