9878666 has 16 divisors (see below), whose sum is σ = 17931456. Its totient is φ = 3984576.

The previous prime is 9878657. The next prime is 9878731. The reversal of 9878666 is 6668789.

9878666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20516 + ... + 20991.

It is an arithmetic number, because the mean of its divisors is an integer number (1120716).

Almost surely, 2^9878666 is an apocalyptic number.

9878666 is a deficient number, since it is larger than the sum of its proper divisors (8052790).

9878666 is a wasteful number, since it uses less digits than its factorization.

9878666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41533.

The product of its digits is 870912, while the sum is 50.

The square root of 9878666 is about 3143.0345209685. The cubic root of 9878666 is about 214.5685669629.

The spelling of 9878666 in words is "nine million, eight hundred seventy-eight thousand, six hundred sixty-six".