28517785275 has 24 divisors (see below), whose sum is σ = 53885035264. Its totient is φ = 13036701600.

The previous prime is 28517785259. The next prime is 28517785301. The reversal of 28517785275 is 57258771582.

It is not a de Polignac number, because 28517785275 - 2⁴ = 28517785259 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27159271 + ... + 27160320.

Almost surely, 2^28517785275 is an apocalyptic number.

28517785275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28517785275 is a deficient number, since it is larger than the sum of its proper divisors (25367249989).

28517785275 is a wasteful number, since it uses less digits than its factorization.

28517785275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54319611 (or 54319606 counting only the distinct ones).

The product of its digits is 10976000, while the sum is 57.

The spelling of 28517785275 in words is "twenty-eight billion, five hundred seventeen million, seven hundred eighty-five thousand, two hundred seventy-five".