How do I find the sum of the digits of really large numbers (with Ruby or another language)?Example: [Math Processing Error]3600 has [Math Processing Error]287 digits. How do I add them?

[Timothy]

Hello, I would like to ask you if a person knows how do i find the sum of the digits of really large numbers (with ruby or another language)? example: [math processing error]3600 has [math processing error]287 digits. how do i add them?  Please answer me.