8688666 has 64 divisors (see below), whose sum is σ = 21593088. Its totient is φ = 2274048.

The previous prime is 8688629. The next prime is 8688671. The reversal of 8688666 is 6668868.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30561 + ... + 30843.

It is an arithmetic number, because the mean of its divisors is an integer number (337392).

Almost surely, 2^8688666 is an apocalyptic number.

8688666 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 8688666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10796544).

8688666 is an abundant number, since it is smaller than the sum of its proper divisors (12904422).

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

8688666 is a wasteful number, since it uses less digits than its factorization.

8688666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355.

The product of its digits is 663552, while the sum is 48.

The square root of 8688666 is about 2947.6543216599. The cubic root of 8688666 is about 205.5816595802.

The spelling of 8688666 in words is "eight million, six hundred eighty-eight thousand, six hundred sixty-six".