Hex #278d97 or rgb(39,141,151) in RGB space is the tint of cyan. It has hue angle of 185.36 degrees, value = 59 and saturation = 74. #278d97 can be obtained by mixing 4 colors: 2 drops of red, 4 drops of blue, 5 drops of cyan, 2 drops of green.
Nearest safe hex - #339999. Below you can see the block with #278d97 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #278d97 to the mixer and play with it.