Alright, let's work through 3591 times 7989 step by step
3591 × 7989 = 7989 × (3591)
+ 7989 × 1 that is equal 7989
+ 7989 × 90 yielding 719010
+ 7989 × 500 that results in 3994500
+ 7989 × 3000 resulting in 23967000

= 28688499
