68320509 has 8 divisors (see below), whose sum is σ = 91571712. Its totient is φ = 45308160.

The previous prime is 68320489. The next prime is 68320513. The reversal of 68320509 is 90502386.

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 68320509 - 2⁵ = 68320477 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 68320509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68320519) 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, 59044 + ... + 60189.

It is an arithmetic number, because the mean of its divisors is an integer number (11446464).

Almost surely, 2^68320509 is an apocalyptic number.

It is an amenable number.

68320509 is a deficient number, since it is larger than the sum of its proper divisors (23251203).

68320509 is a wasteful number, since it uses less digits than its factorization.

68320509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119427.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 68320509 is about 8265.6221181469. The cubic root of 68320509 is about 408.8057833321.

The spelling of 68320509 in words is "sixty-eight million, three hundred twenty thousand, five hundred nine".