The number 79988
79988 is a composite number with 6 divisors. Its prime factorisation is × 19997. Divisors (6): 1, 2, 4, 19997, 39994, 79988.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
79988 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
79988 is composite. Its prime factorisation is
- 3
The divisors add up to 139986; without 79988 itself that is 59998, so 79988 is deficient (59998 is less than 79988). Euler's totient φ(79988) = 39992 numbers up to 79988 share no factor with it.
- 4
The digits of 79988 add up to 41, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 94 steps to reach 1.
LaTeX source of the formulas on this page
\[ 79988 = 2^{2} \times 19997 \]79988 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 6 |
| Sum of divisors | 139986 |
| Euler totient φ(n) | 39992 |
| Square | 6398080144 |
| Cube | 511769634558272 |
| Square root | 282.821498 (= 2√19997) |
| Digit sum / digital root | 41 / 5 |
| Collatz steps to 1 | 94 |
| Scientific notation | 7.9988 × |
79988 in other forms
| Form | Value |
|---|---|
| In words | seventy-nine thousand nine hundred and eighty-eight |
| Binary (base 2) | 10011100001110100 |
| Octal (base 8) | 234164 |
| Hexadecimal (base 16) | 13874 |
| Base 3 | 11001201112 |
| As time | 79988 seconds = 22 h 13 min 8 s |
Is 79988 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (79988 ÷ 2 = 39994) | 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 (79988 ÷ 4 = 19997) | 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 | No (remainder 6) | 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 79988 a prime number?
No. 79988 = × 19997, so it is divisible by 2.
What are the factors of 79988?
1, 2, 4, 19997, 39994, 79988.
What is 79988 in binary?
10011100001110100 (hexadecimal 13874, octal 234164).
What is the square root of 79988?
About 282.8215, exactly 2√19997.
Is 79988 divisible by 3?
No. Its digits add up to 41, which is not a multiple of 3.
What is special about the number 79988?
It is a composite number with 6 divisors.