Alright, let's work through 90871253 times 80003972 step by step
90871253 × 80003972 = 80003972 × (90871253)
+ 80003972 × 3 which equals 240011916
+ 80003972 × 50 resulting in 4000198600
+ 80003972 × 200 producing 16000794400
+ 80003972 × 1000 which equals 80003972000
+ 80003972 × 70000 that results in 5600278040000
+ 80003972 × 800000 yielding 64003177600000
+ 80003972 × 0000000 yielding 0
+ 80003972 × 90000000 what gives us 7200357480000000

= 7270061180616916
