Alright, let's work through 51305724 times 71284915 step by step
51305724 × 71284915 = 71284915 × (51305724)
+ 71284915 × 4 what gives us 285139660
+ 71284915 × 20 resulting in 1425698300
+ 71284915 × 700 which equals 49899440500
+ 71284915 × 5000 what gives us 356424575000
+ 71284915 × 00000 which equals 0
+ 71284915 × 300000 that results in 21385474500000
+ 71284915 × 1000000 producing 71284915000000
+ 71284915 × 50000000 giving us 3564245750000000

= 3657324174353460
