28056108085 has 4 divisors (see below), whose sum is σ = 33667329708. Its totient is φ = 22444886464.

The previous prime is 28056108061. The next prime is 28056108089. The reversal of 28056108085 is 58080165082.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21198777604 + 6857330481 = 145598^2 + 82809^2 .

It is a cyclic number.

It is not a de Polignac number, because 28056108085 - 2⁷ = 28056107957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28056108089) 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, 2805610804 + ... + 2805610813.

It is an arithmetic number, because the mean of its divisors is an integer number (8416832427).

Almost surely, 2^28056108085 is an apocalyptic number.

It is an amenable number.

28056108085 is a deficient number, since it is larger than the sum of its proper divisors (5611221623).

28056108085 is an equidigital number, since it uses as much as digits as its factorization.

28056108085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5611221622.

The product of its (nonzero) digits is 153600, while the sum is 43.

The spelling of 28056108085 in words is "twenty-eight billion, fifty-six million, one hundred eight thousand, eighty-five".