68404709 has 4 divisors (see below), whose sum is σ = 68462316. Its totient is φ = 68347104.

The previous prime is 68404681. The next prime is 68404711. The reversal of 68404709 is 90740486.

It is a happy number.

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 11356900 + 57047809 = 3370^2 + 7553^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68404709 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 (68404799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26984 + ... + 29409.

It is an arithmetic number, because the mean of its divisors is an integer number (17115579).

Almost surely, 2^68404709 is an apocalyptic number.

It is an amenable number.

68404709 is a deficient number, since it is larger than the sum of its proper divisors (57607).

68404709 is a wasteful number, since it uses less digits than its factorization.

68404709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57606.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 68404709 is about 8270.7139353263. The cubic root of 68404709 is about 408.9736554031.

The spelling of 68404709 in words is "sixty-eight million, four hundred four thousand, seven hundred nine".