



Can 28 be represented by dots arranged in a rectangular array with more than one row and one column? What are the possible arrays? 219
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what is 28 divisible by Informational
- Are any of the perfect square numbers (other than 1) divisors of 28? 403
- What is 28 in base 3? Are any of the digits divisors of 28? 272
- Is 28 divisible by the number of letters in its English spelling ("twenty-eight")? 189
- What is 28 modulo 11? 332
- What is the sequence of sums of squares of digits starting from 28? 396
- Is 28 related to any figurate numbers (other than triangular)? 389
- Does the divisibility rule for 7 directly help in determining divisibility by 28? 288
- If you have 28 items, can you divide them into equal groups of 22 with no remainder? 236
- Is 28 an untouchable number? (Not the sum of the proper divisors of any positive integer) 373
- What are the proper divisors of 28? 161
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