68784109 has 2 divisors, whose sum is σ = 68784110. Its totient is φ = 68784108.

The previous prime is 68784097. The next prime is 68784113. The reversal of 68784109 is 90148786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68641225 + 142884 = 8285^2 + 378^2 .

It is a cyclic number.

It is not a de Polignac number, because 68784109 - 2⁹ = 68783597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68784139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34392054 + 34392055.

It is an arithmetic number, because the mean of its divisors is an integer number (34392055).

Almost surely, 2^68784109 is an apocalyptic number.

It is an amenable number.

68784109 is a deficient number, since it is larger than the sum of its proper divisors (1).

68784109 is an equidigital number, since it uses as much as digits as its factorization.

68784109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 68784109 is about 8293.6185709255. The cubic root of 68784109 is about 409.7283725338.

The spelling of 68784109 in words is "sixty-eight million, seven hundred eighty-four thousand, one hundred nine".