even, composite · 72nd positive integer
The number 72
72 is an even composite number. It's known as the rule-of-72 number used to estimate doubling time at compound interest. It is the 72nd positive integer.
Quick reference
| Prime factorization | 2 × 2 × 2 × 3 × 3 |
| Divisors | 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72 |
| Binary | 1001000 |
| Hexadecimal | 0x48 |
| Roman numeral | LXXII |
| Digit sum | 9 |
| Properties | even, composite |
Why 72 is notable
The rule-of-72 number used to estimate doubling time at compound interest.
Reading 72 in NumGrid context
The 72 record above pulls directly from classical number theory plus NumGrid solver-derived puzzle statistics. What follows is the per-entity context — how 72 sits in the broader integer properties and number-guessing puzzles distribution and which underlying factors drive the headline numbers.
The methodology behind every numeric value on this page is publicly documented on the classical number theory plus NumGrid solver-derived puzzle statistics portal and described in detail on this site’s methodology page. Refresh cadence varies by underlying series; the page surfaces the as-of date for each number so readers can trace any figure back to the source release.
For readers using this page as a decision input, the related-entity pages elsewhere on the site provide the comparison set. The most useful comparison for 72 is typically a peer within positive integers within the NumGrid target pool with similar size, similar exposure, or similar geography — not the national-level summary alone.
Frequently asked
Is 72 a prime number?
No. 72 is composite. Its prime factorization is 2 × 2 × 2 × 3 × 3.
What are the factors of 72?
The factors (divisors) of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72.
What is 72 in binary?
72 in binary is 1001000. In hexadecimal it's 48.
What is 72 as a Roman numeral?
72 in Roman numerals is LXXII.
What's the digit sum of 72?
Adding the digits of 72: 7 + 2 = 9.