856576863 has 20 divisors (see below), whose sum is σ = 1280591400. Its totient is φ = 570598992.

The previous prime is 856576801. The next prime is 856576883. The reversal of 856576863 is 368675658.

856576863 is a `hidden beast` number, since 8 + 5 + 6 + 576 + 8 + 63 = 666.

It is not a de Polignac number, because 856576863 - 2¹² = 856572767 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856576883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 122056 + ... + 128882.

It is an arithmetic number, because the mean of its divisors is an integer number (64029570).

Almost surely, 2^856576863 is an apocalyptic number.

856576863 is a deficient number, since it is larger than the sum of its proper divisors (424014537).

856576863 is a wasteful number, since it uses less digits than its factorization.

856576863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8388 (or 8379 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 54.

The square root of 856576863 is about 29267.3344020258. The cubic root of 856576863 is about 949.7051210371.

The spelling of 856576863 in words is "eight hundred fifty-six million, five hundred seventy-six thousand, eight hundred sixty-three".