28117886566 has 16 divisors (see below), whose sum is σ = 52584099840. Its totient is φ = 10955020680.

The previous prime is 28117886527. The next prime is 28117886567. The reversal of 28117886566 is 66568871182.

It is a self number, because there is not a number n which added to its sum of digits gives 28117886566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28117886567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91291686 + ... + 91291993.

It is an arithmetic number, because the mean of its divisors is an integer number (3286506240).

Almost surely, 2^28117886566 is an apocalyptic number.

28117886566 is a deficient number, since it is larger than the sum of its proper divisors (24466213274).

28117886566 is a wasteful number, since it uses less digits than its factorization.

28117886566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182583699.

The product of its digits is 7741440, while the sum is 58.

The spelling of 28117886566 in words is "twenty-eight billion, one hundred seventeen million, eight hundred eighty-six thousand, five hundred sixty-six".