The number 28379
28379 is a composite number with 8 divisors. Its prime factorisation is 13 × 37 × 59. Divisors (8): 1, 13, 37, 59, 481, 767, 2183, 28379.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
28379 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
28379 is composite. Its prime factorisation is
- 3
The divisors add up to 31920; without 28379 itself that is 3541, so 28379 is deficient (3541 is less than 28379). Euler's totient φ(28379) = 25056 numbers up to 28379 share no factor with it.
- 4
The digits of 28379 add up to 29, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 103 steps to reach 1.
LaTeX source of the formulas on this page
\[ 28379 = 13 \times 37 \times 59 \]
28379 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 31920 |
| Euler totient φ(n) | 25056 |
| Square | 805367641 |
| Cube | 22855528283939 |
| Square root | 168.460678 |
| Digit sum / digital root | 29 / 2 |
| Collatz steps to 1 | 103 |
| Scientific notation | 2.8379 × |
28379 in other forms
| Form | Value |
|---|---|
| In words | twenty-eight thousand three hundred and seventy-nine |
| Binary (base 2) | 110111011011011 |
| Octal (base 8) | 67333 |
| Hexadecimal (base 16) | 6EDB |
| Base 3 | 1102221002 |
| As time | 28379 seconds = 7 h 52 min 59 s |
Is 28379 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | No (remainder 1) | 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 3) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 4) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 5) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 1) | 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 3) | 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 | No (remainder 9) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 10) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 11) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 28379 a prime number?
No. 28379 = 13 × 37 × 59, so it is divisible by 13.
What are the factors of 28379?
1, 13, 37, 59, 481, 767, 2183, 28379.
What is 28379 in binary?
110111011011011 (hexadecimal 6EDB, octal 67333).
What is the square root of 28379?
About 168.4607.
Is 28379 divisible by 3?
No. Its digits add up to 29, which is not a multiple of 3.
What is special about the number 28379?
It is a composite number with 8 divisors.