68740687 has 2 divisors, whose sum is σ = 68740688. Its totient is φ = 68740686.

The previous prime is 68740627. The next prime is 68740691. The reversal of 68740687 is 78604786.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68740687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68740627) 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, 34370343 + 34370344.

It is an arithmetic number, because the mean of its divisors is an integer number (34370344).

Almost surely, 2^68740687 is an apocalyptic number.

68740687 is a deficient number, since it is larger than the sum of its proper divisors (1).

68740687 is an equidigital number, since it uses as much as digits as its factorization.

68740687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 451584, while the sum is 46.

The square root of 68740687 is about 8291.0003618381. Note that the first 3 decimals coincide. The cubic root of 68740687 is about 409.6421366735.

The spelling of 68740687 in words is "sixty-eight million, seven hundred forty thousand, six hundred eighty-seven".