28056108013 has 2 divisors, whose sum is σ = 28056108014. Its totient is φ = 28056108012.

The previous prime is 28056108011. The next prime is 28056108061. The reversal of 28056108013 is 31080165082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27853273449 + 202834564 = 166893^2 + 14242^2 .

It is a cyclic number.

It is not a de Polignac number, because 28056108013 - 2¹ = 28056108011 is a prime.

Together with 28056108011, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 28056108013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28056108011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14028054006 + 14028054007.

It is an arithmetic number, because the mean of its divisors is an integer number (14028054007).

Almost surely, 2^28056108013 is an apocalyptic number.

It is an amenable number.

28056108013 is a deficient number, since it is larger than the sum of its proper divisors (1).

28056108013 is an equidigital number, since it uses as much as digits as its factorization.

28056108013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 34.

The spelling of 28056108013 in words is "twenty-eight billion, fifty-six million, one hundred eight thousand, thirteen".