68336309 has 2 divisors, whose sum is σ = 68336310. Its totient is φ = 68336308.

The previous prime is 68336269. The next prime is 68336321. The reversal of 68336309 is 90363386.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67486225 + 850084 = 8215^2 + 922^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68336309 is a prime.

It is a super-2 number, since 2×68336309² = 9339702255486962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68336329) 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, 34168154 + 34168155.

It is an arithmetic number, because the mean of its divisors is an integer number (34168155).

Almost surely, 2^68336309 is an apocalyptic number.

It is an amenable number.

68336309 is a deficient number, since it is larger than the sum of its proper divisors (1).

68336309 is an equidigital number, since it uses as much as digits as its factorization.

68336309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 38.

The square root of 68336309 is about 8266.5778288237. The cubic root of 68336309 is about 408.8372947754.

The spelling of 68336309 in words is "sixty-eight million, three hundred thirty-six thousand, three hundred nine".