855017856 has 672 divisors, whose sum is σ = 3431539080. Its totient is φ = 209018880.

The previous prime is 855017819. The next prime is 855017861. The reversal of 855017856 is 658710558.

855017856 is a `hidden beast` number, since 8 + 550 + 17 + 85 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (672).

It is a congruent number.

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 83 ways as a sum of consecutive naturals, for example, 50295160 + ... + 50295176.

Almost surely, 2^855017856 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 855017856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1715769540).

855017856 is an abundant number, since it is smaller than the sum of its proper divisors (2576521224).

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

855017856 is a wasteful number, since it uses less digits than its factorization.

855017856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74 (or 40 counting only the distinct ones).

The product of its (nonzero) digits is 336000, while the sum is 45.

The square root of 855017856 is about 29240.6883639903. The cubic root of 855017856 is about 949.1286029781.

The spelling of 855017856 in words is "eight hundred fifty-five million, seventeen thousand, eight hundred fifty-six".