The number 61428
61428 is a composite number with 12 divisors. Its prime factorisation is × 3 × 5119. Divisors (12): 1, 2, 3, 4, 6, 12, 5119, 10238, 15357, 20476, 30714, 61428.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
61428 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
61428 is composite. Its prime factorisation is
- 3
The divisors add up to 143360; without 61428 itself that is 81932, so 61428 is abundant (81932 is more than 61428). Euler's totient φ(61428) = 20472 numbers up to 61428 share no factor with it.
- 4
The digits of 61428 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 117 steps to reach 1.
LaTeX source of the formulas on this page
\[ 61428 = 2^{2} \times 3 \times 5119 \]61428 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 12 |
| Sum of divisors | 143360 |
| Euler totient φ(n) | 20472 |
| Square | 3773399184 |
| Cube | 231792365074752 |
| Square root | 247.846727 (= 2√15357) |
| Digit sum / digital root | 21 / 3 |
| Collatz steps to 1 | 117 |
| Scientific notation | 6.1428 × |
61428 in other forms
| Form | Value |
|---|---|
| In words | sixty-one thousand four hundred and twenty-eight |
| Binary (base 2) | 1110111111110100 |
| Octal (base 8) | 167764 |
| Hexadecimal (base 16) | EFF4 |
| Base 3 | 10010021010 |
| As time | 61428 seconds = 17 h 3 min 48 s |
Is 61428 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (61428 ÷ 2 = 30714) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | Yes (61428 ÷ 3 = 20476) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | Yes (61428 ÷ 4 = 15357) | 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 (61428 ÷ 6 = 10238) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 3) | 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 4) | 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 (61428 ÷ 12 = 5119) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 61428 a prime number?
No. 61428 = × 3 × 5119, so it is divisible by 2.
What are the factors of 61428?
1, 2, 3, 4, 6, 12, 5119, 10238, 15357, 20476, 30714, 61428.
What is 61428 in binary?
1110111111110100 (hexadecimal EFF4, octal 167764).
What is the square root of 61428?
About 247.8467, exactly 2√15357.
Is 61428 divisible by 3?
Yes. Its digits add up to 21, a multiple of 3.
What is special about the number 61428?
It is a composite number with 12 divisors.