Hex #5d868b or rgb(93,134,139) in RGB space is the tint of cyan. It has hue angle of 186.52 degrees, value = 55 and saturation = 33. #5d868b can be obtained by mixing 4 colors: 1 drop of red, 3 drops of cyan, 3 drops of white, 4 drops of black.
Nearest safe hex - #669999. Below you can see the block with #5d868b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #5d868b to the mixer and play with it.