68488309 has 2 divisors, whose sum is σ = 68488310. Its totient is φ = 68488308.

The previous prime is 68488261. The next prime is 68488313. The reversal of 68488309 is 90388486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68310225 + 178084 = 8265^2 + 422^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68488309 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68488709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34244154 + 34244155.

It is an arithmetic number, because the mean of its divisors is an integer number (34244155).

Almost surely, 2^68488309 is an apocalyptic number.

It is an amenable number.

68488309 is a deficient number, since it is larger than the sum of its proper divisors (1).

68488309 is an equidigital number, since it uses as much as digits as its factorization.

68488309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 331776, while the sum is 46.

The square root of 68488309 is about 8275.7663693461. The cubic root of 68488309 is about 409.1401950032.

The spelling of 68488309 in words is "sixty-eight million, four hundred eighty-eight thousand, three hundred nine".