Alright, let's work through 8618992 times 8391749 step by step
8618992 × 8391749 = 8391749 × (8618992)
+ 8391749 × 2 producing 16783498
+ 8391749 × 90 resulting in 755257410
+ 8391749 × 900 giving us 7552574100
+ 8391749 × 8000 that equals 67133992000
+ 8391749 × 10000 which equals 83917490000
+ 8391749 × 600000 yielding 5035049400000
+ 8391749 × 8000000 yielding 67133992000000

= 72328417497008
