The number 28010
28010 is a composite number with 8 divisors. Its prime factorisation is 2 × 5 × 2801. Divisors (8): 1, 2, 5, 10, 2801, 5602, 14005, 28010.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
28010 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
28010 is composite. Its prime factorisation is
- 3
The divisors add up to 50436; without 28010 itself that is 22426, so 28010 is deficient (22426 is less than 28010). Euler's totient φ(28010) = 11200 numbers up to 28010 share no factor with it.
- 4
The digits of 28010 add up to 11, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 33 steps to reach 1.
LaTeX source of the formulas on this page
\[ 28010 = 2 \times 5 \times 2801 \]
28010 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 50436 |
| Euler totient φ(n) | 11200 |
| Square | 784560100 |
| Cube | 21975528401000 |
| Square root | 167.361883 |
| Digit sum / digital root | 11 / 2 |
| Collatz steps to 1 | 33 |
| Scientific notation | 2.801 × |
28010 in other forms
| Form | Value |
|---|---|
| In words | twenty-eight thousand and ten |
| Binary (base 2) | 110110101101010 |
| Octal (base 8) | 66552 |
| Hexadecimal (base 16) | 6D6A |
| Base 3 | 1102102102 |
| As time | 28010 seconds = 7 h 46 min 50 s |
Is 28010 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (28010 ÷ 2 = 14005) | 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 | No (remainder 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (28010 ÷ 5 = 5602) | 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 | 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 2) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 2) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | Yes (28010 ÷ 10 = 2801) | 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 | No (remainder 2) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 28010 a prime number?
No. 28010 = 2 × 5 × 2801, so it is divisible by 2.
What are the factors of 28010?
1, 2, 5, 10, 2801, 5602, 14005, 28010.
What is 28010 in binary?
110110101101010 (hexadecimal 6D6A, octal 66552).
What is the square root of 28010?
About 167.3619.
Is 28010 divisible by 3?
No. Its digits add up to 11, which is not a multiple of 3.
What is special about the number 28010?
It is a composite number with 8 divisors.