Hex #717984 or rgb(113,121,132) in RGB space is the tint of blue. It has hue angle of 214.74 degrees, value = 52 and saturation = 14. #717984 can be obtained by mixing 3 colors: 1 drop of blue, 4 drops of white, 4 drops of black.
Nearest safe hex - #666699. Below you can see the block with #717984 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #717984 to the mixer and play with it.