90
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353, each time you double the number then take 1 away.
That depends on how you define "opposite." It could be -89, 1/89 or something that isn't a number at all.
89 x 7 = 623 The smallest number over 600 divisible by 89 is therefore 623.
The number 89 is a prime number, which means it is only divisible by 1 and itself. In other words, the only numbers that can go into 89 without leaving a remainder are 1 and 89. This is because 89 does not have any other factors besides these two.