68388689 has 2 divisors, whose sum is σ = 68388690. Its totient is φ = 68388688.

The previous prime is 68388659. The next prime is 68388701. The reversal of 68388689 is 98688386.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64320400 + 4068289 = 8020^2 + 2017^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68388689 is a prime.

It is not a weakly prime, because it can be changed into another prime (68388659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34194344 + 34194345.

It is an arithmetic number, because the mean of its divisors is an integer number (34194345).

Almost surely, 2^68388689 is an apocalyptic number.

It is an amenable number.

68388689 is a deficient number, since it is larger than the sum of its proper divisors (1).

68388689 is an equidigital number, since it uses as much as digits as its factorization.

68388689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3981312, while the sum is 56.

The square root of 68388689 is about 8269.7454011596. The cubic root of 68388689 is about 408.9417264633.

The spelling of 68388689 in words is "sixty-eight million, three hundred eighty-eight thousand, six hundred eighty-nine".