Hex #5b7180 or rgb(91,113,128) in RGB space is the tint of blue. It has hue angle of 204.32 degrees, value = 50 and saturation = 29. #5b7180 can be obtained by mixing 4 colors: 5 drops of red, 3 drops of blue, 5 drops of cyan, 1 drop of green.
Nearest safe hex - #666699. Below you can see the block with #5b7180 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #5b7180 to the mixer and play with it.