680740847 has 2 divisors, whose sum is σ = 680740848. Its totient is φ = 680740846.

The previous prime is 680740831. The next prime is 680740849. The reversal of 680740847 is 748047086.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 680740847 - 2⁴ = 680740831 is a prime.

Together with 680740849, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 680740798 and 680740807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680740849) 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, 340370423 + 340370424.

It is an arithmetic number, because the mean of its divisors is an integer number (340370424).

Almost surely, 2^680740847 is an apocalyptic number.

680740847 is a deficient number, since it is larger than the sum of its proper divisors (1).

680740847 is an equidigital number, since it uses as much as digits as its factorization.

680740847 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 301056, while the sum is 44.

The square root of 680740847 is about 26091.0108466498. The cubic root of 680740847 is about 879.6851693176.

The spelling of 680740847 in words is "six hundred eighty million, seven hundred forty thousand, eight hundred forty-seven".