The number 87490
87490 is a composite number with 16 divisors. Its prime factorisation is 2 × 5 × 13 × 673. Divisors (16): 1, 2, 5, 10, 13, 26, 65, 130, 673, 1346, 3365, 6730, 8749, 17498, 43745, 87490.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
87490 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
87490 is composite. Its prime factorisation is
- 3
The divisors add up to 169848; without 87490 itself that is 82358, so 87490 is deficient (82358 is less than 87490). Euler's totient φ(87490) = 32256 numbers up to 87490 share no factor with it.
- 4
The digits of 87490 add up to 28, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 226 steps to reach 1.
LaTeX source of the formulas on this page
\[ 87490 = 2 \times 5 \times 13 \times 673 \]
87490 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 169848 |
| Euler totient φ(n) | 32256 |
| Square | 7654500100 |
| Cube | 669692213749000 |
| Square root | 295.787086 |
| Digit sum / digital root | 28 / 1 |
| Collatz steps to 1 | 226 |
| Scientific notation | 8.749 × |
87490 in other forms
| Form | Value |
|---|---|
| In words | eighty-seven thousand four hundred and ninety |
| Binary (base 2) | 10101010111000010 |
| Octal (base 8) | 252702 |
| Hexadecimal (base 16) | 155C2 |
| Base 3 | 11110000101 |
| As time | 87490 seconds = 24 h 18 min 10 s |
Is 87490 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (87490 ÷ 2 = 43745) | 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 | Yes (87490 ÷ 5 = 17498) | 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 4) | 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 2) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 1) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | Yes (87490 ÷ 10 = 8749) | 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 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 87490 a prime number?
No. 87490 = 2 × 5 × 13 × 673, so it is divisible by 2.
What are the factors of 87490?
1, 2, 5, 10, 13, 26, 65, 130, 673, 1346, 3365, 6730, 8749, 17498, 43745, 87490.
What is 87490 in binary?
10101010111000010 (hexadecimal 155C2, octal 252702).
What is the square root of 87490?
About 295.7871.
Is 87490 divisible by 3?
No. Its digits add up to 28, which is not a multiple of 3.
What is special about the number 87490?
It is a composite number with 16 divisors.