851022644 has 12 divisors (see below), whose sum is σ = 1529540964. Its totient is φ = 414010944.

The previous prime is 851022629. The next prime is 851022647. The reversal of 851022644 is 446220158.

851022644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 636048400 + 214974244 = 25220^2 + 14662^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 851022644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851022647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2874929 + ... + 2875224.

It is an arithmetic number, because the mean of its divisors is an integer number (127461747).

Almost surely, 2^851022644 is an apocalyptic number.

It is an amenable number.

851022644 is a deficient number, since it is larger than the sum of its proper divisors (678518320).

851022644 is a wasteful number, since it uses less digits than its factorization.

851022644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5750194 (or 5750192 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 851022644 is about 29172.2924022093. The cubic root of 851022644 is about 947.6479744200.

The spelling of 851022644 in words is "eight hundred fifty-one million, twenty-two thousand, six hundred forty-four".