The number 72427
72427 is a palindrome: it reads 72427 backwards too. Its prime factorisation is 23 × 47 × 67. Divisors (8): 1, 23, 47, 67, 1081, 1541, 3149, 72427.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 72427: a palindrome: it reads 72427 backwards too.
- 2
72427 is composite. Its prime factorisation is
- 3
The divisors add up to 78336; without 72427 itself that is 5909, so 72427 is deficient (5909 is less than 72427). Euler's totient φ(72427) = 66792 numbers up to 72427 share no factor with it.
- 4
The digits of 72427 add up to 22, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 143 steps to reach 1.
LaTeX source of the formulas on this page
\[ 72427 = 23 \times 47 \times 67 \]
72427 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 78336 |
| Euler totient φ(n) | 66792 |
| Square | 5245670329 |
| Cube | 379928164918483 |
| Square root | 269.122649 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 143 |
| Scientific notation | 7.2427 × |
72427 in other forms
| Form | Value |
|---|---|
| In words | seventy-two thousand four hundred and twenty-seven |
| Binary (base 2) | 10001101011101011 |
| Octal (base 8) | 215353 |
| Hexadecimal (base 16) | 11AEB |
| Base 3 | 10200100111 |
| As time | 72427 seconds = 20 h 7 min 7 s |
Is 72427 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 | No (remainder 1) | 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 1) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 5) | 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 4) | 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 3) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 72427 a prime number?
No. 72427 = 23 × 47 × 67, so it is divisible by 23.
What are the factors of 72427?
1, 23, 47, 67, 1081, 1541, 3149, 72427.
What is 72427 in binary?
10001101011101011 (hexadecimal 11AEB, octal 215353).
What is the square root of 72427?
About 269.1226.
Is 72427 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 72427?
72427 is a palindrome: it reads 72427 backwards too.