Hex #717f7b or rgb(113,127,123) in RGB space is the tint of greenish cian. It has hue angle of 162.86 degrees, value = 50 and saturation = 11. #717f7b can be obtained by mixing 4 colors: 1 drop of yellow, 2 drops of blue, 3 drops of white, 3 drops of black.
Nearest safe hex - #666666. Below you can see the block with #717f7b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #717f7b to the mixer and play with it.