68709309 has 8 divisors (see below), whose sum is σ = 92716512. Its totient is φ = 45254160.

The previous prime is 68709307. The next prime is 68709337. The reversal of 68709309 is 90390786.

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 68709309 - 2¹ = 68709307 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68709307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137722 + ... + 138219.

It is an arithmetic number, because the mean of its divisors is an integer number (11589564).

Almost surely, 2^68709309 is an apocalyptic number.

It is an amenable number.

68709309 is a deficient number, since it is larger than the sum of its proper divisors (24007203).

68709309 is a wasteful number, since it uses less digits than its factorization.

68709309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276027.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 68709309 is about 8289.1078530805. The cubic root of 68709309 is about 409.5797975272.

The spelling of 68709309 in words is "sixty-eight million, seven hundred nine thousand, three hundred nine".