The number 87449
87449 is a composite number with 4 divisors. Its prime factorisation is 157 × 557. Divisors (4): 1, 157, 557, 87449.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 87449: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 157 × 557, the product of two primes.
- 2
87449 is composite. Its prime factorisation is
- 3
The divisors add up to 88164; without 87449 itself that is 715, so 87449 is deficient (715 is less than 87449). Euler's totient φ(87449) = 86736 numbers up to 87449 share no factor with it.
- 4
The digits of 87449 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 58 steps to reach 1.
LaTeX source of the formulas on this page
\[ 87449 = 157 \times 557 \]
87449 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 88164 |
| Euler totient φ(n) | 86736 |
| Square | 7647327601 |
| Cube | 668751151379849 |
| Square root | 295.717771 |
| Digit sum / digital root | 32 / 5 |
| Collatz steps to 1 | 58 |
| Scientific notation | 8.7449 × |
87449 in other forms
| Form | Value |
|---|---|
| In words | eighty-seven thousand four hundred and forty-nine |
| Binary (base 2) | 10101010110011001 |
| Octal (base 8) | 252631 |
| Hexadecimal (base 16) | 15599 |
| Base 3 | 11102221212 |
| As time | 87449 seconds = 24 h 17 min 29 s |
Is 87449 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 5) | 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 10) | 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 87449 a prime number?
No. 87449 = 157 × 557, so it is divisible by 157.
What are the factors of 87449?
1, 157, 557, 87449.
What is 87449 in binary?
10101010110011001 (hexadecimal 15599, octal 252631).
What is the square root of 87449?
About 295.7178.
Is 87449 divisible by 3?
No. Its digits add up to 32, which is not a multiple of 3.
What is special about the number 87449?
87449 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 157 × 557, the product of two primes.