Hex #667a4d or rgb(102,122,77) in RGB space is the tint of olive. It has hue angle of 86.67 degrees, value = 48 and saturation = 37. #667a4d can be obtained by mixing 4 colors: 2 drops of yellow, 1 drop of cyan, 2 drops of white, 5 drops of black.
Nearest safe hex - #666666. Below you can see the block with #667a4d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #667a4d to the mixer and play with it.