68784727679 has 4 divisors (see below), whose sum is σ = 68842001760. Its totient is φ = 68727453600.

The previous prime is 68784727663. The next prime is 68784727681. The reversal of 68784727679 is 97672748786.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97672748786 = 2 ⋅48836374393.

It is a cyclic number.

It is not a de Polignac number, because 68784727679 - 2⁴ = 68784727663 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 (68784720679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28635239 + ... + 28637640.

It is an arithmetic number, because the mean of its divisors is an integer number (17210500440).

Almost surely, 2^68784727679 is an apocalyptic number.

68784727679 is a deficient number, since it is larger than the sum of its proper divisors (57274081).

68784727679 is a wasteful number, since it uses less digits than its factorization.

68784727679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57274080.

The product of its digits is 398297088, while the sum is 71.

The spelling of 68784727679 in words is "sixty-eight billion, seven hundred eighty-four million, seven hundred twenty-seven thousand, six hundred seventy-nine".