68609329 has 4 divisors (see below), whose sum is σ = 68682276. Its totient is φ = 68536384.

The previous prime is 68609309. The next prime is 68609351. The reversal of 68609329 is 92390686.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92390686 = 2 ⋅46195343.

It can be written as a sum of positive squares in 2 ways, for example, as 53802225 + 14807104 = 7335^2 + 3848^2 .

It is a cyclic number.

It is not a de Polignac number, because 68609329 - 2⁹ = 68608817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68609309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35044 + ... + 36949.

It is an arithmetic number, because the mean of its divisors is an integer number (17170569).

Almost surely, 2^68609329 is an apocalyptic number.

It is an amenable number.

68609329 is a deficient number, since it is larger than the sum of its proper divisors (72947).

68609329 is an equidigital number, since it uses as much as digits as its factorization.

68609329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72946.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 68609329 is about 8283.0748517685. The cubic root of 68609329 is about 409.3810390811.

The spelling of 68609329 in words is "sixty-eight million, six hundred nine thousand, three hundred twenty-nine".