Alright, let's work through 8658 times 8721 step by step
8658 × 8721 = 8721 × (8658)
+ 8721 × 8 that equals 69768
+ 8721 × 50 resulting in 436050
+ 8721 × 600 giving us 5232600
+ 8721 × 8000 that equals 69768000

= 75506418
