The number 61240
61240 is a composite number with 16 divisors. Its prime factorisation is × 5 × 1531. Divisors (16): 1, 2, 4, 5, 8, 10, 20, 40, 1531, 3062, 6124, 7655, 12248, 15310, 30620, 61240.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
61240 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
61240 is composite. Its prime factorisation is
- 3
The divisors add up to 137880; without 61240 itself that is 76640, so 61240 is abundant (76640 is more than 61240). Euler's totient φ(61240) = 24480 numbers up to 61240 share no factor with it.
- 4
The digits of 61240 add up to 13, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 86 steps to reach 1.
LaTeX source of the formulas on this page
\[ 61240 = 2^{3} \times 5 \times 1531 \]61240 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 137880 |
| Euler totient φ(n) | 24480 |
| Square | 3750337600 |
| Cube | 229670674624000 |
| Square root | 247.467170 (= 2√15310) |
| Digit sum / digital root | 13 / 4 |
| Collatz steps to 1 | 86 |
| Scientific notation | 6.124 × |
61240 in other forms
| Form | Value |
|---|---|
| In words | sixty-one thousand two hundred and forty |
| Binary (base 2) | 1110111100111000 |
| Octal (base 8) | 167470 |
| Hexadecimal (base 16) | EF38 |
| Base 3 | 10010000011 |
| As time | 61240 seconds = 17 h 0 min 40 s |
Is 61240 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (61240 ÷ 2 = 30620) | 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 | Yes (61240 ÷ 4 = 15310) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (61240 ÷ 5 = 12248) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 4) | 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 | Yes (61240 ÷ 8 = 7655) | 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 | Yes (61240 ÷ 10 = 6124) | 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 4) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 61240 a prime number?
No. 61240 = × 5 × 1531, so it is divisible by 2.
What are the factors of 61240?
1, 2, 4, 5, 8, 10, 20, 40, 1531, 3062, 6124, 7655, 12248, 15310, 30620, 61240.
What is 61240 in binary?
1110111100111000 (hexadecimal EF38, octal 167470).
What is the square root of 61240?
About 247.4672, exactly 2√15310.
Is 61240 divisible by 3?
No. Its digits add up to 13, which is not a multiple of 3.
What is special about the number 61240?
It is a composite number with 16 divisors.