68531729 has 8 divisors (see below), whose sum is σ = 78375360. Its totient is φ = 58701456.

The previous prime is 68531713. The next prime is 68531737. The reversal of 68531729 is 92713586.

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 68531729 - 2⁴ = 68531713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68531759) 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, 13007 + ... + 17499.

It is an arithmetic number, because the mean of its divisors is an integer number (9796920).

Almost surely, 2^68531729 is an apocalyptic number.

It is an amenable number.

68531729 is a deficient number, since it is larger than the sum of its proper divisors (9843631).

68531729 is a wasteful number, since it uses less digits than its factorization.

68531729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6679.

The product of its digits is 90720, while the sum is 41.

The square root of 68531729 is about 8278.3892756985. The cubic root of 68531729 is about 409.2266385373.

The spelling of 68531729 in words is "sixty-eight million, five hundred thirty-one thousand, seven hundred twenty-nine".