Hex #5b8480 or rgb(91,132,128) in RGB space is the tint of cyan. It has hue angle of 174.15 degrees, value = 52 and saturation = 31. #5b8480 can be obtained by mixing 4 colors: 3 drops of blue, 2 drops of green, 5 drops of white, 4 drops of black.
Nearest safe hex - #669999. Below you can see the block with #5b8480 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #5b8480 to the mixer and play with it.