Hex #008980 or rgb(0,137,128) in RGB space is the tint of cyan. It has hue angle of 176.06 degrees, value = 54 and saturation = 100. #008980 can be obtained by mixing 3 colors: 5 drops of cyan, 1 drop of green, 4 drops of black.
Nearest safe hex - #009999. Below you can see the block with #008980 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #008980 to the mixer and play with it.