28166868975 has 48 divisors (see below), whose sum is σ = 53443047680. Its totient is φ = 12822796800.

The previous prime is 28166868967. The next prime is 28166868979. The reversal of 28166868975 is 57986866182.

It is not a de Polignac number, because 28166868975 - 2³ = 28166868967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28166868979) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15216 + ... + 237834.

Almost surely, 2^28166868975 is an apocalyptic number.

28166868975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28166868975 is a deficient number, since it is larger than the sum of its proper divisors (25276178705).

28166868975 is a wasteful number, since it uses less digits than its factorization.

28166868975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222880 (or 222875 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 66.

The spelling of 28166868975 in words is "twenty-eight billion, one hundred sixty-six million, eight hundred sixty-eight thousand, nine hundred seventy-five".