Alright, let's work through 67878192 times 63507940 step by step
67878192 × 63507940 = 63507940 × (67878192)
+ 63507940 × 2 yielding 127015880
+ 63507940 × 90 which equals 5715714600
+ 63507940 × 100 that is equal 6350794000
+ 63507940 × 8000 that equals 508063520000
+ 63507940 × 70000 resulting in 4445555800000
+ 63507940 × 800000 yielding 50806352000000
+ 63507940 × 7000000 which equals 444555580000000
+ 63507940 × 60000000 that results in 3810476400000000

= 4310804144844480
