28056124881 has 12 divisors (see below), whose sum is σ = 40570206352. Its totient is φ = 18683455896.

The previous prime is 28056124847. The next prime is 28056124927. The reversal of 28056124881 is 18842165082.

28056124881 is a `hidden beast` number, since 2 + 8 + 0 + 561 + 2 + 4 + 8 + 81 = 666.

It is not a de Polignac number, because 28056124881 - 2¹¹ = 28056122833 is a prime.

It is a super-2 number, since 2×28056124881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28056124781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1710331 + ... + 1726656.

Almost surely, 2^28056124881 is an apocalyptic number.

It is an amenable number.

28056124881 is a deficient number, since it is larger than the sum of its proper divisors (12514081471).

28056124881 is a wasteful number, since it uses less digits than its factorization.

28056124881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3437900 (or 3437897 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 45.

The spelling of 28056124881 in words is "twenty-eight billion, fifty-six million, one hundred twenty-four thousand, eight hundred eighty-one".