68409809 has 8 divisors (see below), whose sum is σ = 73846080. Its totient is φ = 62998416.

The previous prime is 68409793. The next prime is 68409821. The reversal of 68409809 is 90890486.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 68409809 - 2⁴ = 68409793 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 68409809.

It is not an unprimeable number, because it can be changed into a prime (68409109) 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, 287 + ... + 11700.

It is an arithmetic number, because the mean of its divisors is an integer number (9230760).

Almost surely, 2^68409809 is an apocalyptic number.

It is an amenable number.

68409809 is a deficient number, since it is larger than the sum of its proper divisors (5436271).

68409809 is a wasteful number, since it uses less digits than its factorization.

68409809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12439.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 68409809 is about 8271.0222463732. The cubic root of 68409809 is about 408.9838190007.

The spelling of 68409809 in words is "sixty-eight million, four hundred nine thousand, eight hundred nine".