658

658 is an even composite integer. It equals 2 × 7 × 47, the product of three distinct primes, making it a sphenic number. It has eight positive divisors: 1, 2, 7, 14, 47, 94, 329, and 658.

In various bases, 658 can be represented as follows: in binary it is 1010010010, in octal it is 1222, and in hexadecimal it is 0x292. In Roman numerals it is written as DCLVIII.

Arithmetic properties of 658 include its divisor sum and totient. The sum of all positive divisors σ(658) equals 1152, so the sum of proper divisors is 1152 − 658 = 494. The Euler totient φ(658) is 276, which counts the integers up to 658 that are coprime to 658.

As a sphenic number, 658 belongs to the class of integers that are the product of three distinct primes. Its factorization and divisor structure illustrate common properties of such numbers, including having exactly eight divisors and a relatively large ratio between the sum of divisors and the number itself compared with many other small integers.

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