The number 87089
87089 is a composite number with 4 divisors. Its prime factorisation is 73 × 1193. Divisors (4): 1, 73, 1193, 87089.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 87089: a semiprime: 73 × 1193, the product of two primes.
- 2
87089 is composite. Its prime factorisation is
- 3
The divisors add up to 88356; without 87089 itself that is 1267, so 87089 is deficient (1267 is less than 87089). Euler's totient φ(87089) = 85824 numbers up to 87089 share no factor with it.
- 4
The digits of 87089 add up to 32, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 195 steps to reach 1.
LaTeX source of the formulas on this page
\[ 87089 = 73 \times 1193 \]
87089 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 88356 |
| Euler totient φ(n) | 85824 |
| Square | 7584493921 |
| Cube | 660525991085969 |
| Square root | 295.108455 |
| Digit sum / digital root | 32 / 5 |
| Collatz steps to 1 | 195 |
| Scientific notation | 8.7089 × |
87089 in other forms
| Form | Value |
|---|---|
| In words | eighty-seven thousand and eighty-nine |
| Binary (base 2) | 10101010000110001 |
| Octal (base 8) | 252061 |
| Hexadecimal (base 16) | 15431 |
| Base 3 | 11102110112 |
| As time | 87089 seconds = 24 h 11 min 29 s |
Is 87089 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 1) | 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 2) | 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 1) | 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 9) | 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 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 87089 a prime number?
No. 87089 = 73 × 1193, so it is divisible by 73.
What are the factors of 87089?
1, 73, 1193, 87089.
What is 87089 in binary?
10101010000110001 (hexadecimal 15431, octal 252061).
What is the square root of 87089?
About 295.1085.
Is 87089 divisible by 3?
No. Its digits add up to 32, which is not a multiple of 3.
What is special about the number 87089?
87089 is a semiprime: 73 × 1193, the product of two primes.