Hex #788a9b or rgb(120,138,155) in RGB space is the tint of blue. It has hue angle of 209.14 degrees, value = 61 and saturation = 23. #788a9b can be obtained by mixing 4 colors: 3 drops of magenta, 5 drops of blue, 4 drops of green, 5 drops of white.
Nearest safe hex - #669999. Below you can see the block with #788a9b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #788a9b to the mixer and play with it.