The number 36428
36428 is a composite number with 12 divisors. Its prime factorisation is × 7 × 1301. Divisors (12): 1, 2, 4, 7, 14, 28, 1301, 2602, 5204, 9107, 18214, 36428.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 36428: a happy number: repeatedly adding the squares of its digits reaches 1.
- 2
36428 is composite. Its prime factorisation is
- 3
The divisors add up to 72912; without 36428 itself that is 36484, so 36428 is abundant (36484 is more than 36428). Euler's totient φ(36428) = 15600 numbers up to 36428 share no factor with it.
- 4
The digits of 36428 add up to 23, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 155 steps to reach 1.
LaTeX source of the formulas on this page
\[ 36428 = 2^{2} \times 7 \times 1301 \]36428 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 12 |
| Sum of divisors | 72912 |
| Euler totient φ(n) | 15600 |
| Square | 1326999184 |
| Cube | 48339926274752 |
| Square root | 190.861206 (= 2√9107) |
| Digit sum / digital root | 23 / 5 |
| Collatz steps to 1 | 155 |
| Scientific notation | 3.6428 × |
36428 in other forms
| Form | Value |
|---|---|
| In words | thirty-six thousand four hundred and twenty-eight |
| Binary (base 2) | 1000111001001100 |
| Octal (base 8) | 107114 |
| Hexadecimal (base 16) | 8E4C |
| Base 3 | 1211222012 |
| As time | 36428 seconds = 10 h 7 min 8 s |
Is 36428 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (36428 ÷ 2 = 18214) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 2) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | Yes (36428 ÷ 4 = 9107) | 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 | No (remainder 2) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | Yes (36428 ÷ 7 = 5204) | 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 5) | 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 7) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 8) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 36428 a prime number?
No. 36428 = × 7 × 1301, so it is divisible by 2.
What are the factors of 36428?
1, 2, 4, 7, 14, 28, 1301, 2602, 5204, 9107, 18214, 36428.
What is 36428 in binary?
1000111001001100 (hexadecimal 8E4C, octal 107114).
What is the square root of 36428?
About 190.8612, exactly 2√9107.
Is 36428 divisible by 3?
No. Its digits add up to 23, which is not a multiple of 3.
What is special about the number 36428?
36428 is a happy number: repeatedly adding the squares of its digits reaches 1.