Alright, let's work through 18107380 times 87564821 step by step
18107380 × 87564821 = 87564821 × (18107380)
+ 87564821 × 0 resulting in 0
+ 87564821 × 80 what gives us 7005185680
+ 87564821 × 300 giving us 26269446300
+ 87564821 × 7000 that is equal 612953747000
+ 87564821 × 00000 that results in 0
+ 87564821 × 100000 that equals 8756482100000
+ 87564821 × 8000000 that is equal 700518568000000
+ 87564821 × 10000000 producing 875648210000000

= 1585569488478980
