1, 2, 4, 5, 7, 8
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3456 is divisible by the single digit numbers 1,2,3,4,6,8,9
A very unique number; it is divisible by each single digit number except 5 and 7.
There are no single-digit numbers divisible by 630. 630 is divisible by 1, 2, 3, 5, 6, 7 and 9.
There are 180 3-digit numbers divisible by five.
There are 18 numbers with 2 digits that are divisible by 5. First 2 digit number is 10 → 10 ÷ 5 = 2 → first 2 digit number divisible by 25 is 5 × 2 Last 2 digit number is 99 → 99 ÷ 5 = 19 4/5 → last 2 digit number divisible by 5 is 5 × 19 → There are 19 - 2 + 1 = 18 numbers with 2 digit divisible by 5.