868878666 has 24 divisors (see below), whose sum is σ = 1892332260. Its totient is φ = 288124416.

The previous prime is 868878649. The next prime is 868878667. The reversal of 868878666 is 666878868.

It can be written as a sum of positive squares in 2 ways, for example, as 868775625 + 103041 = 29475^2 + 321^2 .

It is not an unprimeable number, because it can be changed into a prime (868878667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121581 + ... + 128528.

Almost surely, 2^868878666 is an apocalyptic number.

868878666 is an abundant number, since it is smaller than the sum of its proper divisors (1023453594).

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

868878666 is a wasteful number, since it uses less digits than its factorization.

868878666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250310 (or 250307 counting only the distinct ones).

The product of its digits is 37158912, while the sum is 63.

The square root of 868878666 is about 29476.7478871059. The cubic root of 868878666 is about 954.2299526106.

The spelling of 868878666 in words is "eight hundred sixty-eight million, eight hundred seventy-eight thousand, six hundred sixty-six".