Change the following numbers into special numbers.
a) 473
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473 (four hundred seventy-three) is an odd three-digits composite number following 472 and preceding 474. In scientific notation, it is written as 4.73 × 102. The sum of its digits is 14. It has a total of 2 prime factors and 4 positive divisors. There are 420 positive integers (up to 473) that are relatively prime to 473.
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