28056136878 has 72 divisors (see below), whose sum is σ = 77141390040. Its totient is φ = 7287305760.

The previous prime is 28056136831. The next prime is 28056136903. The reversal of 28056136878 is 87863165082.

28056136878 is a `hidden beast` number, since 2 + 8 + 0 + 561 + 3 + 6 + 8 + 78 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1436193 + ... + 1455596.

It is an arithmetic number, because the mean of its divisors is an integer number (1071408195).

Almost surely, 2^28056136878 is an apocalyptic number.

28056136878 is an abundant number, since it is smaller than the sum of its proper divisors (49085253162).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28056136878 is a wasteful number, since it uses less digits than its factorization.

28056136878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2891822 (or 2891812 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 54.

The spelling of 28056136878 in words is "twenty-eight billion, fifty-six million, one hundred thirty-six thousand, eight hundred seventy-eight".