851804856 has 256 divisors, whose sum is σ = 2958336000. Its totient is φ = 221460480.

The previous prime is 851804831. The next prime is 851804867. The reversal of 851804856 is 658408158.

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 63 ways as a sum of consecutive naturals, for example, 796290 + ... + 797358.

It is an arithmetic number, because the mean of its divisors is an integer number (11556000).

Almost surely, 2^851804856 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 851804856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1479168000).

851804856 is an abundant number, since it is smaller than the sum of its proper divisors (2106531144).

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

851804856 is a wasteful number, since it uses less digits than its factorization.

851804856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139 (or 1129 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 45.

The square root of 851804856 is about 29185.6960855827. The cubic root of 851804856 is about 947.9382270276.

The spelling of 851804856 in words is "eight hundred fifty-one million, eight hundred four thousand, eight hundred fifty-six".