172 (number)
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172 (one hundred and seventy-two) is the natural number following 171 and preceding 173.
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| Cardinal | One hundred [and] seventy-two |
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| Ordinal | 172nd | ||
| Factorization |  |
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| Roman numeral | CLXXII | ||
| Binary | 10101100 | ||
| Hexadecimal | AC | ||
Although a noncototient, 172 is the sum of Euler's totient function φ(x) over the first twenty-three integers.
172 is a repdigit in base 6 (444).
- In aviation, and in particular in the aviation-frequency radio exchange (pronounced as one-seventy-two), the number 172 is associated with Cessna 172.
For the year, see 172 AD.
