Alright, let's work through 78829461 times 63997653 step by step
78829461 × 63997653 = 63997653 × (78829461)
+ 63997653 × 1 that equals 63997653
+ 63997653 × 60 that results in 3839859180
+ 63997653 × 400 giving us 25599061200
+ 63997653 × 9000 giving us 575978877000
+ 63997653 × 20000 that equals 1279953060000
+ 63997653 × 800000 that is equal 51198122400000
+ 63997653 × 8000000 what gives us 511981224000000
+ 63997653 × 70000000 yielding 4479835710000000

= 5044900491255033
