Alright, let's work through 45138921 times 86129598 step by step
45138921 × 86129598 = 86129598 × (45138921)
+ 86129598 × 1 what gives us 86129598
+ 86129598 × 20 yielding 1722591960
+ 86129598 × 900 giving us 77516638200
+ 86129598 × 8000 that equals 689036784000
+ 86129598 × 30000 that equals 2583887940000
+ 86129598 × 100000 what gives us 8612959800000
+ 86129598 × 5000000 that results in 430647990000000
+ 86129598 × 40000000 that is equal 3445183920000000

= 3887797119883758
