28056444813 has 6 divisors (see below), whose sum is σ = 40525975854. Its totient is φ = 18704296536.

The previous prime is 28056444781. The next prime is 28056444827. The reversal of 28056444813 is 31844465082.

28056444813 is a `hidden beast` number, since 2 + 8 + 0 + 564 + 4 + 4 + 81 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 27053012484 + 1003432329 = 164478^2 + 31677^2 .

It is not a de Polignac number, because 28056444813 - 2⁵ = 28056444781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28056444613) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1558691370 + ... + 1558691387.

It is an arithmetic number, because the mean of its divisors is an integer number (6754329309).

Almost surely, 2^28056444813 is an apocalyptic number.

It is an amenable number.

28056444813 is a deficient number, since it is larger than the sum of its proper divisors (12469531041).

28056444813 is a wasteful number, since it uses less digits than its factorization.

28056444813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3117382763 (or 3117382760 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 45.

The spelling of 28056444813 in words is "twenty-eight billion, fifty-six million, four hundred forty-four thousand, eight hundred thirteen".