68729329 has 4 divisors (see below), whose sum is σ = 68773860. Its totient is φ = 68684800.

The previous prime is 68729321. The next prime is 68729347. The reversal of 68729329 is 92392786.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92392786 = 2 ⋅46196393.

It can be written as a sum of positive squares in 2 ways, for example, as 33350625 + 35378704 = 5775^2 + 5948^2 .

It is a cyclic number.

It is not a de Polignac number, because 68729329 - 2³ = 68729321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68729321) 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, 19864 + ... + 23065.

It is an arithmetic number, because the mean of its divisors is an integer number (17193465).

Almost surely, 2^68729329 is an apocalyptic number.

It is an amenable number.

68729329 is a deficient number, since it is larger than the sum of its proper divisors (44531).

68729329 is a wasteful number, since it uses less digits than its factorization.

68729329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44530.

The product of its digits is 326592, while the sum is 46.

The square root of 68729329 is about 8290.3153739770. The cubic root of 68729329 is about 409.6195737545.

The spelling of 68729329 in words is "sixty-eight million, seven hundred twenty-nine thousand, three hundred twenty-nine".