Alright, let's work through 87121793 times 73010115 step by step
87121793 × 73010115 = 73010115 × (87121793)
+ 73010115 × 3 yielding 219030345
+ 73010115 × 90 that results in 6570910350
+ 73010115 × 700 that equals 51107080500
+ 73010115 × 1000 yielding 73010115000
+ 73010115 × 20000 what gives us 1460202300000
+ 73010115 × 100000 that results in 7301011500000
+ 73010115 × 7000000 that is equal 511070805000000
+ 73010115 × 80000000 resulting in 5840809200000000

= 6360772125936195
