68083709 has 4 divisors (see below), whose sum is σ = 68111004. Its totient is φ = 68056416.

The previous prime is 68083681. The next prime is 68083711. The reversal of 68083709 is 90738086.

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 12581209 + 55502500 = 3547^2 + 7450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68083709 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 (68083789) 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, 9482 + ... + 15035.

It is an arithmetic number, because the mean of its divisors is an integer number (17027751).

Almost surely, 2^68083709 is an apocalyptic number.

It is an amenable number.

68083709 is a deficient number, since it is larger than the sum of its proper divisors (27295).

68083709 is a wasteful number, since it uses less digits than its factorization.

68083709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27294.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 68083709 is about 8251.2852938194. The cubic root of 68083709 is about 408.3329274280.

The spelling of 68083709 in words is "sixty-eight million, eighty-three thousand, seven hundred nine".