856111080 has 128 divisors (see below), whose sum is σ = 2867166720. Its totient is φ = 202702080.

The previous prime is 856111073. The next prime is 856111127. The reversal of 856111080 is 80111658.

It is a happy number.

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, 49219 + ... + 64301.

It is an arithmetic number, because the mean of its divisors is an integer number (22399740).

Almost surely, 2^856111080 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 856111080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1433583360).

856111080 is an abundant number, since it is smaller than the sum of its proper divisors (2011055640).

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

856111080 is a wasteful number, since it uses less digits than its factorization.

856111080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15151 (or 15147 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 30.

The square root of 856111080 is about 29259.3759331945. The cubic root of 856111080 is about 949.5329486284.

The spelling of 856111080 in words is "eight hundred fifty-six million, one hundred eleven thousand, eighty".