851504856 has 64 divisors (see below), whose sum is σ = 2169504000. Its totient is φ = 278428800.

The previous prime is 851504821. The next prime is 851504861. The reversal of 851504856 is 658405158.

851504856 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 15 ways as a sum of consecutive naturals, for example, 876451 + ... + 877421.

It is an arithmetic number, because the mean of its divisors is an integer number (33898500).

Almost surely, 2^851504856 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 851504856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1084752000).

851504856 is an abundant number, since it is smaller than the sum of its proper divisors (1317999144).

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

851504856 is a wasteful number, since it uses less digits than its factorization.

851504856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640 (or 1636 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 42.

The square root of 851504856 is about 29180.5561290391. The cubic root of 851504856 is about 947.8269281159.

The spelling of 851504856 in words is "eight hundred fifty-one million, five hundred four thousand, eight hundred fifty-six".