The number 48721
48721 is a composite number with 4 divisors. Its prime factorisation is 83 × 587. Divisors (4): 1, 83, 587, 48721.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 48721: a semiprime: 83 × 587, the product of two primes.
- 2
48721 is composite. Its prime factorisation is
- 3
The divisors add up to 49392; without 48721 itself that is 671, so 48721 is deficient (671 is less than 48721). Euler's totient φ(48721) = 48052 numbers up to 48721 share no factor with it.
- 4
The digits of 48721 add up to 22, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 65 steps to reach 1.
LaTeX source of the formulas on this page
\[ 48721 = 83 \times 587 \]
48721 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 49392 |
| Euler totient φ(n) | 48052 |
| Square | 2373735841 |
| Cube | 115650783909361 |
| Square root | 220.728340 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 65 |
| Scientific notation | 4.8721 × |
48721 in other forms
| Form | Value |
|---|---|
| In words | forty-eight thousand seven hundred and twenty-one |
| Binary (base 2) | 1011111001010001 |
| Octal (base 8) | 137121 |
| Hexadecimal (base 16) | BE51 |
| Base 3 | 2110211111 |
| As time | 48721 seconds = 13 h 32 min 1 s |
Is 48721 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 1) | 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 1) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 1) | 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 1) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 4) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 1) | 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 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 48721 a prime number?
No. 48721 = 83 × 587, so it is divisible by 83.
What are the factors of 48721?
1, 83, 587, 48721.
What is 48721 in binary?
1011111001010001 (hexadecimal BE51, octal 137121).
What is the square root of 48721?
About 220.7283.
Is 48721 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 48721?
48721 is a semiprime: 83 × 587, the product of two primes.