68722909 has 2 divisors, whose sum is σ = 68722910. Its totient is φ = 68722908.

The previous prime is 68722903. The next prime is 68722931. The reversal of 68722909 is 90922786.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53144100 + 15578809 = 7290^2 + 3947^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68722909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68722903) 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, 34361454 + 34361455.

It is an arithmetic number, because the mean of its divisors is an integer number (34361455).

Almost surely, 2^68722909 is an apocalyptic number.

It is an amenable number.

68722909 is a deficient number, since it is larger than the sum of its proper divisors (1).

68722909 is an equidigital number, since it uses as much as digits as its factorization.

68722909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 68722909 is about 8289.9281661544. The cubic root of 68722909 is about 409.6068191824.

The spelling of 68722909 in words is "sixty-eight million, seven hundred twenty-two thousand, nine hundred nine".