856403568 has 120 divisors (see below), whose sum is σ = 2551957200. Its totient is φ = 267328512.

The previous prime is 856403539. The next prime is 856403573. The reversal of 856403568 is 865304658.

856403568 is a `hidden beast` number, since 85 + 6 + 4 + 0 + 3 + 568 = 666.

856403568 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 241746 + ... + 245262.

It is an arithmetic number, because the mean of its divisors is an integer number (21266310).

Almost surely, 2^856403568 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 856403568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1275978600).

856403568 is an abundant number, since it is smaller than the sum of its proper divisors (1695553632).

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

856403568 is a wasteful number, since it uses less digits than its factorization.

856403568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3639 (or 3630 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The square root of 856403568 is about 29264.3736990902. The cubic root of 856403568 is about 949.6410714244.

The spelling of 856403568 in words is "eight hundred fifty-six million, four hundred three thousand, five hundred sixty-eight".