27856815870 has 96 divisors (see below), whose sum is σ = 73935700992. Its totient is φ = 6711110016.

The previous prime is 27856815829. The next prime is 27856815871. The reversal of 27856815870 is 7851865872.

It is a self number, because there is not a number n which added to its sum of digits gives 27856815870.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27856815871) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 179839 + ... + 296741.

It is an arithmetic number, because the mean of its divisors is an integer number (770163552).

Almost surely, 2^27856815870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27856815870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36967850496).

27856815870 is an abundant number, since it is smaller than the sum of its proper divisors (46078885122).

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

27856815870 is a wasteful number, since it uses less digits than its factorization.

27856815870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116986 (or 116973 counting only the distinct ones).

The product of its (nonzero) digits is 7526400, while the sum is 57.

The spelling of 27856815870 in words is "twenty-seven billion, eight hundred fifty-six million, eight hundred fifteen thousand, eight hundred seventy".