Alright, let's work through 87819454 times 61498109 step by step
87819454 × 61498109 = 61498109 × (87819454)
+ 61498109 × 4 yielding 245992436
+ 61498109 × 50 that results in 3074905450
+ 61498109 × 400 that equals 24599243600
+ 61498109 × 9000 that results in 553482981000
+ 61498109 × 10000 which equals 614981090000
+ 61498109 × 800000 that is equal 49198487200000
+ 61498109 × 7000000 that is equal 430486763000000
+ 61498109 × 80000000 producing 4919848720000000

= 5400730354412486
