The number 80998
80998 is a composite number with 4 divisors. Its prime factorisation is 2 × 40499. Divisors (4): 1, 2, 40499, 80998.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 80998: a semiprime: 2 × 40499, the product of two primes.
- 2
80998 is composite. Its prime factorisation is
- 3
The divisors add up to 121500; without 80998 itself that is 40502, so 80998 is deficient (40502 is less than 80998). Euler's totient φ(80998) = 40498 numbers up to 80998 share no factor with it.
- 4
The digits of 80998 add up to 34, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 182 steps to reach 1.
LaTeX source of the formulas on this page
\[ 80998 = 2 \times 40499 \]
80998 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 121500 |
| Euler totient φ(n) | 40498 |
| Square | 6560676004 |
| Cube | 531401634971992 |
| Square root | 284.601476 |
| Digit sum / digital root | 34 / 7 |
| Collatz steps to 1 | 182 |
| Scientific notation | 8.0998 × |
80998 in other forms
| Form | Value |
|---|---|
| In words | eighty thousand nine hundred and ninety-eight |
| Binary (base 2) | 10011110001100110 |
| Octal (base 8) | 236146 |
| Hexadecimal (base 16) | 13C66 |
| Base 3 | 11010002221 |
| As time | 80998 seconds = 22 h 29 min 58 s |
Is 80998 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (80998 ÷ 2 = 40499) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 1) | 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 | No (remainder 4) | 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 6) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 7) | 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 5) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 80998 a prime number?
No. 80998 = 2 × 40499, so it is divisible by 2.
What are the factors of 80998?
1, 2, 40499, 80998.
What is 80998 in binary?
10011110001100110 (hexadecimal 13C66, octal 236146).
What is the square root of 80998?
About 284.6015.
Is 80998 divisible by 3?
No. Its digits add up to 34, which is not a multiple of 3.
What is special about the number 80998?
80998 is a semiprime: 2 × 40499, the product of two primes.