68864209 has 2 divisors, whose sum is σ = 68864210. Its totient is φ = 68864208.

The previous prime is 68864197. The next prime is 68864239. The reversal of 68864209 is 90246886.

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., 68558400 + 305809 = 8280^2 + 553^2 .

It is a cyclic number.

It is not a de Polignac number, because 68864209 - 2²³ = 60475601 is a prime.

It is not a weakly prime, because it can be changed into another prime (68864239) 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, 34432104 + 34432105.

It is an arithmetic number, because the mean of its divisors is an integer number (34432105).

Almost surely, 2^68864209 is an apocalyptic number.

It is an amenable number.

68864209 is a deficient number, since it is larger than the sum of its proper divisors (1).

68864209 is an equidigital number, since it uses as much as digits as its factorization.

68864209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 68864209 is about 8298.4461798580. The cubic root of 68864209 is about 409.8873555309.

The spelling of 68864209 in words is "sixty-eight million, eight hundred sixty-four thousand, two hundred nine".