28726686679 has 2 divisors, whose sum is σ = 28726686680. Its totient is φ = 28726686678.

The previous prime is 28726686643. The next prime is 28726686727. The reversal of 28726686679 is 97668662782.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28726686679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28726686379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14363343339 + 14363343340.

It is an arithmetic number, because the mean of its divisors is an integer number (14363343340).

Almost surely, 2^28726686679 is an apocalyptic number.

28726686679 is a deficient number, since it is larger than the sum of its proper divisors (1).

28726686679 is an equidigital number, since it uses as much as digits as its factorization.

28726686679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 146313216, while the sum is 67.

The spelling of 28726686679 in words is "twenty-eight billion, seven hundred twenty-six million, six hundred eighty-six thousand, six hundred seventy-nine".