851525856 has 144 divisors (see below), whose sum is σ = 2522677248. Its totient is φ = 272160000.

The previous prime is 851525839. The next prime is 851525863. The reversal of 851525856 is 658525158.

It is a tau number, because it is divible by the number of its divisors (144).

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, 1133481 + ... + 1134231.

It is an arithmetic number, because the mean of its divisors is an integer number (17518592).

Almost surely, 2^851525856 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 851525856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1261338624).

851525856 is an abundant number, since it is smaller than the sum of its proper divisors (1671151392).

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

851525856 is a wasteful number, since it uses less digits than its factorization.

851525856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925 (or 914 counting only the distinct ones).

The product of its digits is 480000, while the sum is 45.

The square root of 851525856 is about 29180.9159554665. The cubic root of 851525856 is about 947.8347198905.

The spelling of 851525856 in words is "eight hundred fifty-one million, five hundred twenty-five thousand, eight hundred fifty-six".