851085380 has 48 divisors (see below), whose sum is σ = 1839922560. Its totient is φ = 330489600.

The previous prime is 851085379. The next prime is 851085397. The reversal of 851085380 is 83580158.

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, 170561 + ... + 175479.

It is an arithmetic number, because the mean of its divisors is an integer number (38331720).

Almost surely, 2^851085380 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 851085380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (919961280).

851085380 is an abundant number, since it is smaller than the sum of its proper divisors (988837180).

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

851085380 is a wasteful number, since it uses less digits than its factorization.

851085380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5180 (or 5178 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 38.

The square root of 851085380 is about 29173.3676492790. The cubic root of 851085380 is about 947.6712602017.

The spelling of 851085380 in words is "eight hundred fifty-one million, eighty-five thousand, three hundred eighty".