674 = 2 x 337.
674 is 220222 in base 3 and 22202 in base 4. It is 828 in base 9.
674 is the sum of the cubes of the first six Fibonacci numbers (A005968).
674 is a number n such that n3 is a sum of two successive primes (A074925).
674 has a representation as a sum of two squares: 674 = 72 + 252.
Source: On-Line Encyclopedia of Integer Sequences
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