Hex #667488 or rgb(102,116,136) in RGB space is the tint of blue. It has hue angle of 215.29 degrees, value = 53 and saturation = 25. #667488 can be obtained by mixing 3 colors: 1 drop of blue, 2 drops of white, 2 drops of black.
Nearest safe hex - #666699. Below you can see the block with #667488 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #667488 to the mixer and play with it.