Alright, let's work through 19987480 times 72487379 step by step
19987480 × 72487379 = 72487379 × (19987480)
+ 72487379 × 0 which equals 0
+ 72487379 × 80 that equals 5798990320
+ 72487379 × 400 giving us 28994951600
+ 72487379 × 7000 giving us 507411653000
+ 72487379 × 80000 which equals 5798990320000
+ 72487379 × 900000 which equals 65238641100000
+ 72487379 × 9000000 that results in 652386411000000
+ 72487379 × 10000000 that results in 724873790000000

= 1448840038014920
