The number 72741
72741 is a composite number with 4 divisors. Its prime factorisation is 3 × 24247. Divisors (4): 1, 3, 24247, 72741.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 72741: a semiprime: 3 × 24247, the product of two primes.
- 2
72741 is composite. Its prime factorisation is
- 3
The divisors add up to 96992; without 72741 itself that is 24251, so 72741 is deficient (24251 is less than 72741). Euler's totient φ(72741) = 48492 numbers up to 72741 share no factor with it.
- 4
The digits of 72741 add up to 21, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 81 steps to reach 1.
LaTeX source of the formulas on this page
\[ 72741 = 3 \times 24247 \]
72741 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 96992 |
| Euler totient φ(n) | 48492 |
| Square | 5291253081 |
| Cube | 384891040365021 |
| Square root | 269.705395 |
| Digit sum / digital root | 21 / 3 |
| Collatz steps to 1 | 81 |
| Scientific notation | 7.2741 × |
72741 in other forms
| Form | Value |
|---|---|
| In words | seventy-two thousand seven hundred and forty-one |
| Binary (base 2) | 10001110000100101 |
| Octal (base 8) | 216045 |
| Hexadecimal (base 16) | 11C25 |
| Base 3 | 10200210010 |
| As time | 72741 seconds = 20 h 12 min 21 s |
Is 72741 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 (72741 ÷ 3 = 24247) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 1) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 1) | 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 5) | 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 1) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 9) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 9) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 72741 a prime number?
No. 72741 = 3 × 24247, so it is divisible by 3.
What are the factors of 72741?
1, 3, 24247, 72741.
What is 72741 in binary?
10001110000100101 (hexadecimal 11C25, octal 216045).
What is the square root of 72741?
About 269.7054.
Is 72741 divisible by 3?
Yes. Its digits add up to 21, a multiple of 3.
What is special about the number 72741?
72741 is a semiprime: 3 × 24247, the product of two primes.