68288309 has 2 divisors, whose sum is σ = 68288310. Its totient is φ = 68288308.

The previous prime is 68288287. The next prime is 68288351. The reversal of 68288309 is 90388286.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50098084 + 18190225 = 7078^2 + 4265^2 .

It is a cyclic number.

It is not a de Polignac number, because 68288309 - 2⁸ = 68288053 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68288309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68288369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34144154 + 34144155.

It is an arithmetic number, because the mean of its divisors is an integer number (34144155).

Almost surely, 2^68288309 is an apocalyptic number.

It is an amenable number.

68288309 is a deficient number, since it is larger than the sum of its proper divisors (1).

68288309 is an equidigital number, since it uses as much as digits as its factorization.

68288309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 68288309 is about 8263.6740618202. The cubic root of 68288309 is about 408.7415487658.

The spelling of 68288309 in words is "sixty-eight million, two hundred eighty-eight thousand, three hundred nine".