Alright, let's work through 3987002 times 45580705 step by step
3987002 × 45580705 = 45580705 × (3987002)
+ 45580705 × 2 that equals 91161410
+ 45580705 × 00 giving us 0
+ 45580705 × 000 that is equal 0
+ 45580705 × 7000 that is equal 319064935000
+ 45580705 × 80000 producing 3646456400000
+ 45580705 × 900000 yielding 41022634500000
+ 45580705 × 3000000 resulting in 136742115000000

= 181730361996410
