68389687 has 2 divisors, whose sum is σ = 68389688. Its totient is φ = 68389686.

The previous prime is 68389679. The next prime is 68389693. The reversal of 68389687 is 78698386.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68389687 - 2³ = 68389679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68389637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34194843 + 34194844.

It is an arithmetic number, because the mean of its divisors is an integer number (34194844).

Almost surely, 2^68389687 is an apocalyptic number.

68389687 is a deficient number, since it is larger than the sum of its proper divisors (1).

68389687 is an equidigital number, since it uses as much as digits as its factorization.

68389687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3483648, while the sum is 55.

The square root of 68389687 is about 8269.8057413702. The cubic root of 68389687 is about 408.9437156902.

The spelling of 68389687 in words is "sixty-eight million, three hundred eighty-nine thousand, six hundred eighty-seven".