856112520 has 128 divisors (see below), whose sum is σ = 2777587200. Its totient is φ = 210272256.

The previous prime is 856112519. The next prime is 856112531. The reversal of 856112520 is 25211658.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91416 + ... + 100344.

It is an arithmetic number, because the mean of its divisors is an integer number (21699900).

Almost surely, 2^856112520 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 856112520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1388793600).

856112520 is an abundant number, since it is smaller than the sum of its proper divisors (1921474680).

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

856112520 is a wasteful number, since it uses less digits than its factorization.

856112520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9007 (or 9003 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 856112520 is about 29259.4005406809. The cubic root of 856112520 is about 949.5334810074.

The spelling of 856112520 in words is "eight hundred fifty-six million, one hundred twelve thousand, five hundred twenty".