7968689 has 2 divisors, whose sum is σ = 7968690. Its totient is φ = 7968688.

The previous prime is 7968683. The next prime is 7968691. The reversal of 7968689 is 9868697.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4389025 + 3579664 = 2095^2 + 1892^2 .

It is a cyclic number.

It is not a de Polignac number, because 7968689 - 2⁴ = 7968673 is a prime.

Together with 7968691, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7968689.

It is not a weakly prime, because it can be changed into another prime (7968683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3984344 + 3984345.

It is an arithmetic number, because the mean of its divisors is an integer number (3984345).

Almost surely, 2^7968689 is an apocalyptic number.

It is an amenable number.

7968689 is a deficient number, since it is larger than the sum of its proper divisors (1).

7968689 is an equidigital number, since it uses as much as digits as its factorization.

7968689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 53.

The square root of 7968689 is about 2822.8866431368. The cubic root of 7968689 is about 199.7387338486.

The spelling of 7968689 in words is "seven million, nine hundred sixty-eight thousand, six hundred eighty-nine".