851021736 has 64 divisors (see below), whose sum is σ = 2192329920. Its totient is φ = 275166720.

The previous prime is 851021713. The next prime is 851021747. The reversal of 851021736 is 637120158.

It is a junction number, because it is equal to n+sod(n) for n = 851021697 and 851021706.

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, 102891 + ... + 110853.

It is an arithmetic number, because the mean of its divisors is an integer number (34255155).

Almost surely, 2^851021736 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 851021736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1096164960).

851021736 is an abundant number, since it is smaller than the sum of its proper divisors (1341308184).

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

851021736 is a wasteful number, since it uses less digits than its factorization.

851021736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8106 (or 8102 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 851021736 is about 29172.2768394927. The cubic root of 851021736 is about 947.6476373884.

The spelling of 851021736 in words is "eight hundred fifty-one million, twenty-one thousand, seven hundred thirty-six".