There is no Prime number equal to 28.
I know you must find this disappointing.
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70 equals 70, and it is not prime.70 equals 70, and it is not prime.70 equals 70, and it is not prime.70 equals 70, and it is not prime.
112
30. 28 x 30 = 840
28 is composite.
28 = 1 x 28, 2 x 14, 4 x 7.