866878868 has 12 divisors (see below), whose sum is σ = 1534084020. Its totient is φ = 428569152.

The previous prime is 866878861. The next prime is 866878879. The reversal of 866878868 is 868878668.

866878868 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 178970884 + 687907984 = 13378^2 + 26228^2 .

It is a super-2 number, since 2×866878868² = 1502957943569922848, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866878861) 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, 1217171 + ... + 1217882.

It is an arithmetic number, because the mean of its divisors is an integer number (127840335).

Almost surely, 2^866878868 is an apocalyptic number.

It is an amenable number.

866878868 is a deficient number, since it is larger than the sum of its proper divisors (667205152).

866878868 is a wasteful number, since it uses less digits than its factorization.

866878868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2435146 (or 2435144 counting only the distinct ones).

The product of its digits is 49545216, while the sum is 65.

The square root of 866878868 is about 29442.8067276202. The cubic root of 866878868 is about 953.4973098327.

The spelling of 866878868 in words is "eight hundred sixty-six million, eight hundred seventy-eight thousand, eight hundred sixty-eight".