680312779 has 2 divisors, whose sum is σ = 680312780. Its totient is φ = 680312778.

The previous prime is 680312753. The next prime is 680312813. The reversal of 680312779 is 977213086.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 680312779 - 2¹¹ = 680310731 is a prime.

It is not a weakly prime, because it can be changed into another prime (680312729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340156389 + 340156390.

It is an arithmetic number, because the mean of its divisors is an integer number (340156390).

Almost surely, 2^680312779 is an apocalyptic number.

680312779 is a deficient number, since it is larger than the sum of its proper divisors (1).

680312779 is an equidigital number, since it uses as much as digits as its factorization.

680312779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 680312779 is about 26082.8061948863. The cubic root of 680312779 is about 879.5007408225.

The spelling of 680312779 in words is "six hundred eighty million, three hundred twelve thousand, seven hundred seventy-nine".