856888920 has 192 divisors, whose sum is σ = 2985577920. Its totient is φ = 212585472.

The previous prime is 856888891. The next prime is 856888937. The reversal of 856888920 is 29888658.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 304962 + ... + 307758.

It is an arithmetic number, because the mean of its divisors is an integer number (15549885).

Almost surely, 2^856888920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 856888920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1492788960).

856888920 is an abundant number, since it is smaller than the sum of its proper divisors (2128689000).

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

856888920 is a wasteful number, since it uses less digits than its factorization.

856888920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2874 (or 2867 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 54.

The square root of 856888920 is about 29272.6650648690. The cubic root of 856888920 is about 949.8204351290.

The spelling of 856888920 in words is "eight hundred fifty-six million, eight hundred eighty-eight thousand, nine hundred twenty".