68029309 has 8 divisors (see below), whose sum is σ = 68651352. Its totient is φ = 67410240.

The previous prime is 68029307. The next prime is 68029333. The reversal of 68029309 is 90392086.

It can be written as a sum of positive squares in 4 ways, for example, as 4826809 + 63202500 = 2197^2 + 7950^2 .

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 68029309 - 2¹ = 68029307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68029307) 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 7 ways as a sum of consecutive naturals, for example, 79327 + ... + 80179.

It is an arithmetic number, because the mean of its divisors is an integer number (8581419).

Almost surely, 2^68029309 is an apocalyptic number.

It is an amenable number.

68029309 is a deficient number, since it is larger than the sum of its proper divisors (622043).

68029309 is a wasteful number, since it uses less digits than its factorization.

68029309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1487.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 68029309 is about 8247.9881789440. The cubic root of 68029309 is about 408.2241435477.

The spelling of 68029309 in words is "sixty-eight million, twenty-nine thousand, three hundred nine".