Alright, let's work through 53047840 times 78337151 step by step
53047840 × 78337151 = 78337151 × (53047840)
+ 78337151 × 0 that equals 0
+ 78337151 × 40 giving us 3133486040
+ 78337151 × 800 that is equal 62669720800
+ 78337151 × 7000 that results in 548360057000
+ 78337151 × 40000 that equals 3133486040000
+ 78337151 × 000000 yielding 0
+ 78337151 × 3000000 producing 235011453000000
+ 78337151 × 50000000 which equals 3916857550000000

= 4155616652303840
