27813538656 has 72 divisors (see below), whose sum is σ = 79131911040. Its totient is φ = 9266823936.

The previous prime is 27813538639. The next prime is 27813538663. The reversal of 27813538656 is 65683531872.

27813538656 is a `hidden beast` number, since 27 + 81 + 3 + 538 + 6 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 623266 + ... + 666398.

It is an arithmetic number, because the mean of its divisors is an integer number (1099054320).

Almost surely, 2^27813538656 is an apocalyptic number.

It is an amenable number.

27813538656 is an abundant number, since it is smaller than the sum of its proper divisors (51318372384).

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

27813538656 is a wasteful number, since it uses less digits than its factorization.

27813538656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45388 (or 45377 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 54.

The spelling of 27813538656 in words is "twenty-seven billion, eight hundred thirteen million, five hundred thirty-eight thousand, six hundred fifty-six".