Names of 28
| Nominal | 28 |
| Cardinal | twenty-eight |
| Ordinal | 28th |
| This number as US currency | twenty-eight dollars |
| Is 28 an odd number? | 28 is NOT an odd number |
| Is 28 an even number? | 28 is an even number |
| Is 28 a palindrome? | 28 is NOT a palindrome number |
| Is 28 a triangle number? | 28 is a triangle number |
28 in other Bases
| Base 2 (Binary) | 111002 |
| Base 3 (Ternary) | 10013 |
| Base 4 (Quaternary) | 1304 |
| Base 5 (Quinary) | 1035 |
| Base 6 (Senary) | 446 |
| Base 8 (Octal) | 348 |
| Base 12 (Duodecimal) | 2412 |
| Base 16 (Hexadecimal) | 1C16 |
| Base 20 (Vigesimal) | 1820 |
Primes and Factors tests for 28
| Is 28 a Prime Number? | 28 is NOT a prime |
| Is 28 a perfect number? | 28 is a perfect number |
| Is 28 a Mersenne Prime? | 28 is NOT a Mersenne prime |
| Is 28 a Fermat Prime? | 28 is NOT a Fermat prime |
| Is 28 a Fibonacci Prime? | 28 is NOT a Fibonacci prime |
| Is 28 a Partition Prime? | 28 is NOT a Partition prime |
| Is 28 a Pell Prime? | 28 is NOT a Pell prime |
| Prime Factors | Prime factors of 28 |
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28 in other Numerals
| 28 in Roman Numeral | XXVIII |
| 28 in Chinese Numeral | 貳拾捌 |
| 28 in Egyptian Numeral | 𓎇𓐁 |
| 28 in Babylonian Numeral |  |
Roots and stuff for 28
| Is 28 a square number? | 28 is NOT a square number |
| Is 28 a cube number? | 28 is NOT a cube number |
| Square root of the number 28 | 5.2915026221292 |
| Cube root of the number 28 | 3.0365889718757 |
Recreational math for 28
| Number 28 reversed | 82 |
| Sum of the digits | 10 |
| No of digits | 2 |