68899709 has 2 divisors, whose sum is σ = 68899710. Its totient is φ = 68899708.

The previous prime is 68899673. The next prime is 68899739. The reversal of 68899709 is 90799886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65205625 + 3694084 = 8075^2 + 1922^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68899709 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 (68899739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34449854 + 34449855.

It is an arithmetic number, because the mean of its divisors is an integer number (34449855).

Almost surely, 2^68899709 is an apocalyptic number.

It is an amenable number.

68899709 is a deficient number, since it is larger than the sum of its proper divisors (1).

68899709 is an equidigital number, since it uses as much as digits as its factorization.

68899709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1959552, while the sum is 56.

The square root of 68899709 is about 8300.5848589121. The cubic root of 68899709 is about 409.9577767345.

The spelling of 68899709 in words is "sixty-eight million, eight hundred ninety-nine thousand, seven hundred nine".