822862820644 has 18 divisors (see below), whose sum is σ = 1529699138450. Its totient is φ = 387229562112.

The previous prime is 822862820639. The next prime is 822862820651. The reversal of 822862820644 is 446028268228.

It can be written as a sum of positive squares in 3 ways, for example, as 168239428900 + 654623391744 = 410170^2 + 809088^2 .

It is a junction number, because it is equal to n+sod(n) for n = 822862820591 and 822862820600.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 355908369 + ... + 355910680.

Almost surely, 2^822862820644 is an apocalyptic number.

It is an amenable number.

822862820644 is a deficient number, since it is larger than the sum of its proper divisors (706836317806).

822862820644 is a wasteful number, since it uses less digits than its factorization.

822862820644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711819087 (or 711819068 counting only the distinct ones).

The product of its (nonzero) digits is 4718592, while the sum is 52.

The spelling of 822862820644 in words is "eight hundred twenty-two billion, eight hundred sixty-two million, eight hundred twenty thousand, six hundred forty-four".