68317309 has 4 divisors (see below), whose sum is σ = 68993820. Its totient is φ = 67640800.

The previous prime is 68317303. The next prime is 68317313. The reversal of 68317309 is 90371386.

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 36360900 + 31956409 = 6030^2 + 5653^2 .

It is a cyclic number.

It is not a de Polignac number, because 68317309 - 2⁹ = 68316797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68317303) 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, 338104 + ... + 338305.

It is an arithmetic number, because the mean of its divisors is an integer number (17248455).

Almost surely, 2^68317309 is an apocalyptic number.

It is an amenable number.

68317309 is a deficient number, since it is larger than the sum of its proper divisors (676511).

68317309 is a wasteful number, since it uses less digits than its factorization.

68317309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676510.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 68317309 is about 8265.4285430339. The cubic root of 68317309 is about 408.7994006761.

The spelling of 68317309 in words is "sixty-eight million, three hundred seventeen thousand, three hundred nine".