Hex #278090 or rgb(39,128,144) in RGB space is the tint of bluish cian. It has hue angle of 189.14 degrees, value = 56 and saturation = 73. #278090 can be obtained by mixing 4 colors: 2 drops of red, 5 drops of blue, 4 drops of cyan, 2 drops of green.
Nearest safe hex - #339999. Below you can see the block with #278090 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #278090 to the mixer and play with it.