Alright, let's work through 87324897 times 39919993 step by step
87324897 × 39919993 = 39919993 × (87324897)
+ 39919993 × 7 that results in 279439951
+ 39919993 × 90 which equals 3592799370
+ 39919993 × 800 yielding 31935994400
+ 39919993 × 4000 resulting in 159679972000
+ 39919993 × 20000 producing 798399860000
+ 39919993 × 300000 which equals 11975997900000
+ 39919993 × 7000000 that results in 279439951000000
+ 39919993 × 80000000 that results in 3193599440000000

= 3486009276965721
