Alright, let's work through 77408247 times 85479447 step by step
77408247 × 85479447 = 85479447 × (77408247)
+ 85479447 × 7 producing 598356129
+ 85479447 × 40 which equals 3419177880
+ 85479447 × 200 producing 17095889400
+ 85479447 × 8000 that is equal 683835576000
+ 85479447 × 00000 what gives us 0
+ 85479447 × 400000 that equals 34191778800000
+ 85479447 × 7000000 which equals 598356129000000
+ 85479447 × 70000000 that is equal 5983561290000000

= 6616814146799409
