Alright, let's work through 42386409 times 87164897 step by step
42386409 × 87164897 = 87164897 × (42386409)
+ 87164897 × 9 that results in 784484073
+ 87164897 × 00 that results in 0
+ 87164897 × 400 producing 34865958800
+ 87164897 × 6000 yielding 522989382000
+ 87164897 × 80000 producing 6973191760000
+ 87164897 × 300000 that equals 26149469100000
+ 87164897 × 2000000 yielding 174329794000000
+ 87164897 × 40000000 resulting in 3486595880000000

= 3694606974684873
