Names of 1644
| Nominal | 1644 |
| Cardinal | one thousand six hundred forty-four |
| Ordinal | 1,644th |
| This number as US currency | one thousand six hundred forty-four dollars |
| Is 1644 an odd number? | 1644 is NOT an odd number |
| Is 1644 an even number? | 1644 is an even number |
| Is 1644 a palindrome? | 1644 is NOT a palindrome number |
| Is 1644 a triangle number? | 1644 is NOT a triangle number |
1644 in other Bases
| Base 2 (Binary) | 110011011002 |
| Base 3 (Ternary) | 20202203 |
| Base 4 (Quaternary) | 1212304 |
| Base 5 (Quinary) | 230345 |
| Base 6 (Senary) | 113406 |
| Base 8 (Octal) | 31548 |
| Base 12 (Duodecimal) | B5012 |
| Base 16 (Hexadecimal) | 66C16 |
| Base 20 (Vigesimal) | 42420 |
Primes and Factors tests for 1644
| Is 1644 a Prime Number? | 1644 is NOT a prime |
| Is 1644 a perfect number? | 1644 is NOT a perfect number |
| Is 1644 a Mersenne Prime? | 1644 is NOT a Mersenne prime |
| Is 1644 a Fermat Prime? | 1644 is NOT a Fermat prime |
| Is 1644 a Fibonacci Prime? | 1644 is NOT a Fibonacci prime |
| Is 1644 a Partition Prime? | 1644 is NOT a Partition prime |
| Is 1644 a Pell Prime? | 1644 is NOT a Pell prime |
| Prime Factors | Prime factors of 1644 |
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1644 in other Numerals
| 1644 in Roman Numeral | MDCXLIV |
| 1644 in Chinese Numeral | 壹仟陸佰肆拾肆 |
| 1644 in Egyptian Numeral | 𓆼𓍧𓎉𓏽 |
| 1644 in Babylonian Numeral |   |
Roots and stuff for 1644
| Is 1644 a square number? | 1644 is NOT a square number |
| Is 1644 a cube number? | 1644 is NOT a cube number |
| Square root of the number 1644 | 40.546269865427 |
| Cube root of the number 1644 | 11.802316886818 |
Recreational math for 1644
| Number 1644 reversed | 4461 |
| Sum of the digits | 15 |
| No of digits | 4 |