68684729 has 2 divisors, whose sum is σ = 68684730. Its totient is φ = 68684728.

The previous prime is 68684723. The next prime is 68684797. The reversal of 68684729 is 92748686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49561600 + 19123129 = 7040^2 + 4373^2 .

It is a cyclic number.

It is not a de Polignac number, because 68684729 - 2⁴ = 68684713 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68684723) 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, 34342364 + 34342365.

It is an arithmetic number, because the mean of its divisors is an integer number (34342365).

Almost surely, 2^68684729 is an apocalyptic number.

It is an amenable number.

68684729 is a deficient number, since it is larger than the sum of its proper divisors (1).

68684729 is an equidigital number, since it uses as much as digits as its factorization.

68684729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 50.

The square root of 68684729 is about 8287.6250518469. The cubic root of 68684729 is about 409.5309508118.

The spelling of 68684729 in words is "sixty-eight million, six hundred eighty-four thousand, seven hundred twenty-nine".