Alright, let's work through 77681020 times 45372515 step by step
77681020 × 45372515 = 45372515 × (77681020)
+ 45372515 × 0 that is equal 0
+ 45372515 × 20 producing 907450300
+ 45372515 × 000 giving us 0
+ 45372515 × 1000 giving us 45372515000
+ 45372515 × 80000 producing 3629801200000
+ 45372515 × 600000 producing 27223509000000
+ 45372515 × 7000000 that equals 317607605000000
+ 45372515 × 70000000 yielding 3176076050000000

= 3524583245165300
