27856558872 has 48 divisors (see below), whose sum is σ = 75453532440. Its totient is φ = 9284450688.

The previous prime is 27856558871. The next prime is 27856558909. The reversal of 27856558872 is 27885565872.

It is a happy number.

27856558872 is a `hidden beast` number, since 2 + 7 + 8 + 5 + 6 + 558 + 8 + 72 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27856558871) 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, 835188 + ... + 867900.

Almost surely, 2^27856558872 is an apocalyptic number.

It is an amenable number.

27856558872 is an abundant number, since it is smaller than the sum of its proper divisors (47596973568).

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

27856558872 is a wasteful number, since it uses less digits than its factorization.

27856558872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44552 (or 44545 counting only the distinct ones).

The product of its digits is 75264000, while the sum is 63.

The spelling of 27856558872 in words is "twenty-seven billion, eight hundred fifty-six million, five hundred fifty-eight thousand, eight hundred seventy-two".