Alright, let's work through 90669645 times 39473590 step by step
90669645 × 39473590 = 39473590 × (90669645)
+ 39473590 × 5 giving us 197367950
+ 39473590 × 40 that equals 1578943600
+ 39473590 × 600 that is equal 23684154000
+ 39473590 × 9000 which equals 355262310000
+ 39473590 × 60000 giving us 2368415400000
+ 39473590 × 600000 which equals 23684154000000
+ 39473590 × 0000000 that is equal 0
+ 39473590 × 90000000 that equals 3552623100000000

= 3579056392175550
