The number 24987
24987 is a composite number with 4 divisors. Its prime factorisation is 3 × 8329. Divisors (4): 1, 3, 8329, 24987.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 24987: a semiprime: 3 × 8329, the product of two primes.
- 2
24987 is composite. Its prime factorisation is
- 3
The divisors add up to 33320; without 24987 itself that is 8333, so 24987 is deficient (8333 is less than 24987). Euler's totient φ(24987) = 16656 numbers up to 24987 share no factor with it.
- 4
The digits of 24987 add up to 30, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 95 steps to reach 1.
LaTeX source of the formulas on this page
\[ 24987 = 3 \times 8329 \]
24987 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 33320 |
| Euler totient φ(n) | 16656 |
| Square | 624350169 |
| Cube | 15600637672803 |
| Square root | 158.072768 |
| Digit sum / digital root | 30 / 3 |
| Collatz steps to 1 | 95 |
| Scientific notation | 2.4987 × |
24987 in other forms
| Form | Value |
|---|---|
| In words | twenty-four thousand nine hundred and eighty-seven |
| Binary (base 2) | 110000110011011 |
| Octal (base 8) | 60633 |
| Hexadecimal (base 16) | 619B |
| Base 3 | 1021021110 |
| As time | 24987 seconds = 6 h 56 min 27 s |
Is 24987 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | No (remainder 1) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | Yes (24987 ÷ 3 = 8329) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 3) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 2) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 3) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 4) | 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 | No (remainder 3) | 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 7) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 6) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 3) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 24987 a prime number?
No. 24987 = 3 × 8329, so it is divisible by 3.
What are the factors of 24987?
1, 3, 8329, 24987.
What is 24987 in binary?
110000110011011 (hexadecimal 619B, octal 60633).
What is the square root of 24987?
About 158.0728.
Is 24987 divisible by 3?
Yes. Its digits add up to 30, a multiple of 3.
What is special about the number 24987?
24987 is a semiprime: 3 × 8329, the product of two primes.