Alright, let's work through 78674906 times 63946209 step by step
78674906 × 63946209 = 63946209 × (78674906)
+ 63946209 × 6 producing 383677254
+ 63946209 × 00 that is equal 0
+ 63946209 × 900 that is equal 57551588100
+ 63946209 × 4000 yielding 255784836000
+ 63946209 × 70000 yielding 4476234630000
+ 63946209 × 600000 that is equal 38367725400000
+ 63946209 × 8000000 what gives us 511569672000000
+ 63946209 × 70000000 that equals 4476234630000000

= 5030961982131354
