821718068 has 12 divisors (see below), whose sum is σ = 1461580932. Its totient is φ = 404123520.

The previous prime is 821718059. The next prime is 821718091. The reversal of 821718068 is 860817128.

821718068 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 9012004 + 812706064 = 3002^2 + 28508^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1683605 + ... + 1684092.

It is an arithmetic number, because the mean of its divisors is an integer number (121798411).

Almost surely, 2^821718068 is an apocalyptic number.

It is an amenable number.

821718068 is a deficient number, since it is larger than the sum of its proper divisors (639862864).

821718068 is a wasteful number, since it uses less digits than its factorization.

821718068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3367762 (or 3367760 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 41.

The square root of 821718068 is about 28665.6251981358. The cubic root of 821718068 is about 936.6434033530.

The spelling of 821718068 in words is "eight hundred twenty-one million, seven hundred eighteen thousand, sixty-eight".