28112806187 has 4 divisors (see below), whose sum is σ = 28141406160. Its totient is φ = 28084206216.

The previous prime is 28112806171. The next prime is 28112806231. The reversal of 28112806187 is 78160821182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28112806187 - 2⁴ = 28112806171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28112805187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14298512 + ... + 14300477.

It is an arithmetic number, because the mean of its divisors is an integer number (7035351540).

Almost surely, 2^28112806187 is an apocalyptic number.

28112806187 is a deficient number, since it is larger than the sum of its proper divisors (28599973).

28112806187 is an equidigital number, since it uses as much as digits as its factorization.

28112806187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28599972.

The product of its (nonzero) digits is 86016, while the sum is 44.

The spelling of 28112806187 in words is "twenty-eight billion, one hundred twelve million, eight hundred six thousand, one hundred eighty-seven".