The largest four-digit Prime number is 9973.
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It is: 79+83+89+97 = 348
Largest 4 digit number with repetition is 9999 Largest 3 digit number without repetition is 987 Difference is 9999 - 987 = 9012.
9984 is the largest 4-digit multiple of 32
9876
8999 is the precise answer