68391789 has 4 divisors (see below), whose sum is σ = 91189056. Its totient is φ = 45594524.

The previous prime is 68391779. The next prime is 68391793. The reversal of 68391789 is 98719386.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68391789 - 2⁹ = 68391277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68391769) 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 3 ways as a sum of consecutive naturals, for example, 11398629 + ... + 11398634.

It is an arithmetic number, because the mean of its divisors is an integer number (22797264).

Almost surely, 2^68391789 is an apocalyptic number.

It is an amenable number.

68391789 is a deficient number, since it is larger than the sum of its proper divisors (22797267).

68391789 is a wasteful number, since it uses less digits than its factorization.

68391789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22797266.

The product of its digits is 653184, while the sum is 51.

The square root of 68391789 is about 8269.9328292314. The cubic root of 68391789 is about 408.9479053613.

The spelling of 68391789 in words is "sixty-eight million, three hundred ninety-one thousand, seven hundred eighty-nine".