685780747 has 2 divisors, whose sum is σ = 685780748. Its totient is φ = 685780746.

The previous prime is 685780741. The next prime is 685780759. The reversal of 685780747 is 747087586.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 685780747 - 2¹¹ = 685778699 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 685780694 and 685780703.

It is not a weakly prime, because it can be changed into another prime (685780741) 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 as a sum of consecutive naturals, namely, 342890373 + 342890374.

It is an arithmetic number, because the mean of its divisors is an integer number (342890374).

Almost surely, 2^685780747 is an apocalyptic number.

685780747 is a deficient number, since it is larger than the sum of its proper divisors (1).

685780747 is an equidigital number, since it uses as much as digits as its factorization.

685780747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2634240, while the sum is 52.

The square root of 685780747 is about 26187.4158137072. The cubic root of 685780747 is about 881.8507652308.

The spelling of 685780747 in words is "six hundred eighty-five million, seven hundred eighty thousand, seven hundred forty-seven".