68868209 has 4 divisors (see below), whose sum is σ = 69004020. Its totient is φ = 68732400.

The previous prime is 68868203. The next prime is 68868223. The reversal of 68868209 is 90286886.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51437584 + 17430625 = 7172^2 + 4175^2 .

It is a cyclic number.

It is not a de Polignac number, because 68868209 - 2⁴ = 68868193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68868203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67142 + ... + 68159.

It is an arithmetic number, because the mean of its divisors is an integer number (17251005).

Almost surely, 2^68868209 is an apocalyptic number.

It is an amenable number.

68868209 is a deficient number, since it is larger than the sum of its proper divisors (135811).

68868209 is a wasteful number, since it uses less digits than its factorization.

68868209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135810.

The product of its (nonzero) digits is 331776, while the sum is 47.

The square root of 68868209 is about 8298.6871853324. The cubic root of 68868209 is about 409.8952915241.

The spelling of 68868209 in words is "sixty-eight million, eight hundred sixty-eight thousand, two hundred nine".