Vastu Shastra Astrology and Numerology It comes to 2+8=10 = 1+0=1. Now add the total date of birth. If it is 28th August 1975 than add all the numbers to single digit that is 2+8+0+8+1+9+7+5=40=4+0=4. This way by adding the day and full date of birth we got two numbers 1 as Lucky number and 4 as Destiny number.