687590882009 has 2 divisors, whose sum is σ = 687590882010. Its totient is φ = 687590882008.

The previous prime is 687590881981. The next prime is 687590882051. The reversal of 687590882009 is 900288095786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 578317662784 + 109273219225 = 760472^2 + 330565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687590882009 is a prime.

It is not a weakly prime, because it can be changed into another prime (687590882809) 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 as a sum of consecutive naturals, namely, 343795441004 + 343795441005.

It is an arithmetic number, because the mean of its divisors is an integer number (343795441005).

Almost surely, 2^687590882009 is an apocalyptic number.

It is an amenable number.

687590882009 is a deficient number, since it is larger than the sum of its proper divisors (1).

687590882009 is an equidigital number, since it uses as much as digits as its factorization.

687590882009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17418240, while the sum is 62.

The spelling of 687590882009 in words is "six hundred eighty-seven billion, five hundred ninety million, eight hundred eighty-two thousand, nine".