The number 28998
28998 is a composite number with 20 divisors. Its prime factorisation is 2 × × 179. Divisors (20): 1, 2, 3, 6, 9, 18, 27, 54, 81, 162, 179, 358, 537, 1074, 1611, 3222 … 28998.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
28998 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
28998 is composite. Its prime factorisation is
- 3
The divisors add up to 65340; without 28998 itself that is 36342, so 28998 is abundant (36342 is more than 28998). Euler's totient φ(28998) = 9612 numbers up to 28998 share no factor with it.
- 4
The digits of 28998 add up to 36, and repeating that until one digit is left gives the digital root 9. The Collatz sequence (halve if even, else 3n+1) takes 72 steps to reach 1.
LaTeX source of the formulas on this page
\[ 28998 = 2 \times 3^{4} \times 179 \]28998 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 20 |
| Sum of divisors | 65340 |
| Euler totient φ(n) | 9612 |
| Square | 840884004 |
| Cube | 24383954347992 |
| Square root | 170.287991 (= 9√358) |
| Digit sum / digital root | 36 / 9 |
| Collatz steps to 1 | 72 |
| Scientific notation | 2.8998 × |
28998 in other forms
| Form | Value |
|---|---|
| In words | twenty-eight thousand nine hundred and ninety-eight |
| Binary (base 2) | 111000101000110 |
| Octal (base 8) | 70506 |
| Hexadecimal (base 16) | 7146 |
| Base 3 | 1110210000 |
| As time | 28998 seconds = 8 h 3 min 18 s |
Is 28998 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (28998 ÷ 2 = 14499) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | Yes (28998 ÷ 3 = 9666) | 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 | No (remainder 3) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | Yes (28998 ÷ 6 = 4833) | 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 | No (remainder 6) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | Yes (28998 ÷ 9 = 3222) | 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 2) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 6) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 28998 a prime number?
No. 28998 = 2 × × 179, so it is divisible by 2.
What are the factors of 28998?
1, 2, 3, 6, 9, 18, 27, 54, 81, 162, 179, 358, 537, 1074, 1611, 3222, 4833, 9666, 14499, 28998.
What is 28998 in binary?
111000101000110 (hexadecimal 7146, octal 70506).
What is the square root of 28998?
About 170.2880, exactly 9√358.
Is 28998 divisible by 3?
Yes. Its digits add up to 36, a multiple of 3.
What is special about the number 28998?
It is a composite number with 20 divisors.