856861888338 has 64 divisors (see below), whose sum is σ = 1916799120000. Its totient is φ = 283722409152.

The previous prime is 856861888331. The next prime is 856861888349. The reversal of 856861888338 is 833888168658.

856861888338 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (856861888331) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35841513 + ... + 35865411.

It is an arithmetic number, because the mean of its divisors is an integer number (29949986250).

Almost surely, 2^856861888338 is an apocalyptic number.

856861888338 is an abundant number, since it is smaller than the sum of its proper divisors (1059937231662).

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

856861888338 is a wasteful number, since it uses less digits than its factorization.

856861888338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28296 (or 28290 counting only the distinct ones).

The product of its digits is 424673280, while the sum is 72.

The spelling of 856861888338 in words is "eight hundred fifty-six billion, eight hundred sixty-one million, eight hundred eighty-eight thousand, three hundred thirty-eight".