68688809 has 8 divisors (see below), whose sum is σ = 78552768. Its totient is φ = 58837680.

The previous prime is 68688799. The next prime is 68688827. The reversal of 68688809 is 90888686.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68688809 - 2¹² = 68684713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68688859) 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 in 7 ways as a sum of consecutive naturals, for example, 15779 + ... + 19655.

It is an arithmetic number, because the mean of its divisors is an integer number (9819096).

Almost surely, 2^68688809 is an apocalyptic number.

It is an amenable number.

68688809 is a deficient number, since it is larger than the sum of its proper divisors (9863959).

68688809 is a wasteful number, since it uses less digits than its factorization.

68688809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6415.

The product of its (nonzero) digits is 1327104, while the sum is 53.

The square root of 68688809 is about 8287.8711983235. The cubic root of 68688809 is about 409.5390596167.

The spelling of 68688809 in words is "sixty-eight million, six hundred eighty-eight thousand, eight hundred nine".