68917687 has 2 divisors, whose sum is σ = 68917688. Its totient is φ = 68917686.

The previous prime is 68917663. The next prime is 68917697. The reversal of 68917687 is 78671986.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68917687 - 2⁷ = 68917559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68917657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34458843 + 34458844.

It is an arithmetic number, because the mean of its divisors is an integer number (34458844).

Almost surely, 2^68917687 is an apocalyptic number.

68917687 is a deficient number, since it is larger than the sum of its proper divisors (1).

68917687 is an equidigital number, since it uses as much as digits as its factorization.

68917687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 52.

The square root of 68917687 is about 8301.6677240179. The cubic root of 68917687 is about 409.9934303925.

The spelling of 68917687 in words is "sixty-eight million, nine hundred seventeen thousand, six hundred eighty-seven".