Hex #778561 or rgb(119,133,97) in RGB space is the tint of olive. It has hue angle of 83.33 degrees, value = 52 and saturation = 27. #778561 can be obtained by mixing 4 colors: 4 drops of yellow, 4 drops of blue, 3 drops of white, 4 drops of black.
Nearest safe hex - #669966. Below you can see the block with #778561 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #778561 to the mixer and play with it.