8688665 has 4 divisors (see below), whose sum is σ = 10426404. Its totient is φ = 6950928.

The previous prime is 8688629. The next prime is 8688671. The reversal of 8688665 is 5668868.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1990921 + 6697744 = 1411^2 + 2588^2 .

It is a cyclic number.

It is not a de Polignac number, because 8688665 - 2⁶ = 8688601 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 868862 + ... + 868871.

It is an arithmetic number, because the mean of its divisors is an integer number (2606601).

Almost surely, 2^8688665 is an apocalyptic number.

It is an amenable number.

8688665 is a deficient number, since it is larger than the sum of its proper divisors (1737739).

8688665 is a wasteful number, since it uses less digits than its factorization.

8688665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1737738.

The product of its digits is 552960, while the sum is 47.

The square root of 8688665 is about 2947.6541520334. The cubic root of 8688665 is about 205.5816516932.

The spelling of 8688665 in words is "eight million, six hundred eighty-eight thousand, six hundred sixty-five".