28
Everything about the number 28 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
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Names of 28
| Nominal | 28 |
| Cardinal | twenty-eight |
| Ordinal | 28th |
| This number as US currency | twenty-eight dollars |
Properties (and some facts) of 28
| 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 |
| Is 28 a triangle number? | 28 is a triangle number |
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28 in other bases
| Base 2 (Binary) | 11100 |
| Base 3 (Ternary) | 1001 |
| Base 4 (Quaternary) | 130 |
| Base 5 (Quinary) | 103 |
| Base 6 (Senary) | 44 |
| Base 8 (Octal) | 34 |
| Base 12 (Duodecimal) | 24 |
| Base 16 (Hexadecimal) | 1C |
| Base 20 (Vigesimal) | 18 |
Primes and factors tests for 28
| Is 28 a prime number? | 28 is not a prime number |
| 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 |
28 in other numeral systems
| 28 in Roman numerals | XXVIII |
| 28 in Chinese numerals | 貳拾捌 |
| 28 in Babylonian numerals |  |
| 28 in Egyptian numerals | 𓎇𓐁 |
Roots and squares 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 28 | 5.2915026221292 |
| Cube root of 28 | 3.0365889718757 |
Recreational math for 28
| Number 28 reversed | 82 |
| Sum of the digits | 10 |
| Number of digits | 2 |
Arithmetic tables for 28
Other pages about 28
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