856706816 has 72 divisors (see below), whose sum is σ = 1965379584. Its totient is φ = 365091840.

The previous prime is 856706801. The next prime is 856706819. The reversal of 856706816 is 618607658.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856706819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 341021 + ... + 343523.

Almost surely, 2^856706816 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 856706816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (982689792).

856706816 is an abundant number, since it is smaller than the sum of its proper divisors (1108672768).

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

856706816 is a wasteful number, since it uses less digits than its factorization.

856706816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2717 (or 2703 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 47.

The square root of 856706816 is about 29269.5544209337. The cubic root of 856706816 is about 949.7531458337.

The spelling of 856706816 in words is "eight hundred fifty-six million, seven hundred six thousand, eight hundred sixteen".