850891620 has 96 divisors (see below), whose sum is σ = 2440972800. Its totient is φ = 221405184.

The previous prime is 850891607. The next prime is 850891621. The reversal of 850891620 is 26198058.

It is not an unprimeable number, because it can be changed into a prime (850891621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 420852 + ... + 422868.

It is an arithmetic number, because the mean of its divisors is an integer number (25426800).

Almost surely, 2^850891620 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 850891620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1220486400).

850891620 is an abundant number, since it is smaller than the sum of its proper divisors (1590081180).

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

850891620 is a wasteful number, since it uses less digits than its factorization.

850891620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2197 (or 2195 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 850891620 is about 29170.0466232058. The cubic root of 850891620 is about 947.5993384243.

It can be divided in two parts, 8508 and 91620, that added together give a triangular number (100128 = T₄₄₇).

The spelling of 850891620 in words is "eight hundred fifty million, eight hundred ninety-one thousand, six hundred twenty".