The number 48
48 is a highly composite number: it has 10 divisors, more than any smaller number. Its prime factorisation is × 3. Divisors (10): 1, 2, 3, 4, 6, 8, 12, 16, 24, 48.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 48: a highly composite number: it has 10 divisors, more than any smaller number; a Harshad number: divisible by its digit sum 12.
- 2
48 is composite. Its prime factorisation is
- 3
The divisors add up to 124; without 48 itself that is 76, so 48 is abundant (76 is more than 48). Euler's totient φ(48) = 16 numbers up to 48 share no factor with it.
- 4
The digits of 48 add up to 12, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 11 steps to reach 1.
LaTeX source of the formulas on this page
\[ 48 = 2^{4} \times 3 \]48 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 10 |
| Sum of divisors | 124 |
| Euler totient φ(n) | 16 |
| Square | 2304 |
| Cube | 110592 |
| Square root | 6.928203 (= 4√3) |
| Digit sum / digital root | 12 / 3 |
| Collatz steps to 1 | 11 |
| Scientific notation | 4.8 × |
48 in other forms
| Form | Value |
|---|---|
| In words | forty-eight |
| Roman numerals | XLVIII |
| Binary (base 2) | 110000 |
| Octal (base 8) | 60 |
| Hexadecimal (base 16) | 30 |
| Base 3 | 1210 |
| As time | 48 seconds |
Is 48 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (48 ÷ 2 = 24) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | Yes (48 ÷ 3 = 16) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | Yes (48 ÷ 4 = 12) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 3) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | Yes (48 ÷ 6 = 8) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 6) | A number is divisible by 7 if double the last digit and subtract it from the rest: the result is a multiple of 7. |
| 8 | Yes (48 ÷ 8 = 6) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 3) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 8) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 4) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | Yes (48 ÷ 12 = 4) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 48 a prime number?
No. 48 = × 3, so it is divisible by 2.
What are the factors of 48?
1, 2, 3, 4, 6, 8, 12, 16, 24, 48.
What is 48 in binary?
110000 (hexadecimal 30, octal 60).
What is the square root of 48?
About 6.9282, exactly 4√3.
What is 48 in Roman numerals?
XLVIII.
Is 48 divisible by 3?
Yes. Its digits add up to 12, a multiple of 3.
What is special about the number 48?
48 is a highly composite number: it has 10 divisors, more than any smaller number; a Harshad number: divisible by its digit sum 12.