8660689 has 2 divisors, whose sum is σ = 8660690. Its totient is φ = 8660688.

The previous prime is 8660683. The next prime is 8660693. The reversal of 8660689 is 9860668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8363664 + 297025 = 2892^2 + 545^2 .

It is a cyclic number.

It is not a de Polignac number, because 8660689 - 2³ = 8660681 is a prime.

8660689 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (8660681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4330344 + 4330345.

It is an arithmetic number, because the mean of its divisors is an integer number (4330345).

Almost surely, 2^8660689 is an apocalyptic number.

It is an amenable number.

8660689 is a deficient number, since it is larger than the sum of its proper divisors (1).

8660689 is an equidigital number, since it uses as much as digits as its factorization.

8660689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 8660689 is about 2942.9048574495. The cubic root of 8660689 is about 205.3607686561.

The spelling of 8660689 in words is "eight million, six hundred sixty thousand, six hundred eighty-nine".