856806064 has 30 divisors (see below), whose sum is σ = 1752043740. Its totient is φ = 405852768.

The previous prime is 856806059. The next prime is 856806079. The reversal of 856806064 is 460608658.

It is a self number, because there is not a number n which added to its sum of digits gives 856806064.

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 5 ways as a sum of consecutive naturals, for example, 68394 + ... + 79945.

It is an arithmetic number, because the mean of its divisors is an integer number (58401458).

Almost surely, 2^856806064 is an apocalyptic number.

It is an amenable number.

856806064 is an abundant number, since it is smaller than the sum of its proper divisors (895237676).

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

856806064 is a wasteful number, since it uses less digits than its factorization.

856806064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148385 (or 148360 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 43.

The square root of 856806064 is about 29271.2497854123. The cubic root of 856806064 is about 949.7898201695.

The spelling of 856806064 in words is "eight hundred fifty-six million, eight hundred six thousand, sixty-four".