68163729 has 8 divisors (see below), whose sum is σ = 92998752. Its totient is φ = 44385600.

The previous prime is 68163721. The next prime is 68163749. The reversal of 68163729 is 92736186.

It is a happy number.

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

It is not a de Polignac number, because 68163729 - 2³ = 68163721 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68163721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264072 + ... + 264329.

It is an arithmetic number, because the mean of its divisors is an integer number (11624844).

Almost surely, 2^68163729 is an apocalyptic number.

It is an amenable number.

68163729 is a deficient number, since it is larger than the sum of its proper divisors (24835023).

68163729 is a wasteful number, since it uses less digits than its factorization.

68163729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528447.

The product of its digits is 108864, while the sum is 42.

The square root of 68163729 is about 8256.1328114318. The cubic root of 68163729 is about 408.4928384581.

The spelling of 68163729 in words is "sixty-eight million, one hundred sixty-three thousand, seven hundred twenty-nine".