Hex #008a8b or rgb(0,138,139) in RGB space is the tint of cyan. It has hue angle of 180.43 degrees, value = 55 and saturation = 100. #008a8b can be obtained by mixing 4 colors: 3 drops of blue, 4 drops of cyan, 2 drops of green, 2 drops of black.
Nearest safe hex - #009999. Below you can see the block with #008a8b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #008a8b to the mixer and play with it.