868816836 has 18 divisors (see below), whose sum is σ = 2196175982. Its totient is φ = 289605600.

The previous prime is 868816813. The next prime is 868816889. The reversal of 868816836 is 638618868.

868816836 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 only one way, i.e., 736796736 + 132020100 = 27144^2 + 11490^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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, 12066865 + ... + 12066936.

Almost surely, 2^868816836 is an apocalyptic number.

It is an amenable number.

868816836 is an abundant number, since it is smaller than the sum of its proper divisors (1327359146).

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

868816836 is a wasteful number, since it uses less digits than its factorization.

868816836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24133811 (or 24133806 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 54.

The square root of 868816836 is about 29475.6990756793. The cubic root of 868816836 is about 954.2073175217.

The spelling of 868816836 in words is "eight hundred sixty-eight million, eight hundred sixteen thousand, eight hundred thirty-six".