654

654 is a natural number that lies between 653 and 655. It is an even, composite number with several notable mathematical properties.

Its prime factorization is 654 = 2 × 3 × 109, making it a product of three distinct primes. Because of this, 654 is a sphenic number and has exactly eight divisors: 1, 2, 3, 6, 109, 218, 327, and 654. The number is divisible by 2, 3, 6, and 109 (since 654 ÷ 109 = 6).

In decimal form, the sum of its digits is 6 + 5 + 4 = 15. The sum of all divisors of 654 equals (1 + 2)(1 + 3)(1 + 109) = 3 × 4 × 110 = 1320, so the sum of proper divisors is 1320 − 654 = 666. Because the sum of its proper divisors (666) exceeds 654, the number is classified as abundant. It is not a prime, square, or Harshad (Niven) number, since 654 is not divisible by the sum of its digits (654 ÷ 15 is not an integer).

Representations of 654 include Roman numerals as DCLIV, binary as 1010001110, and hexadecimal as 0x28E. These alternate bases reflect its place in number systems beyond decimal.

In summary, 654 is a composite, abundant, sphenic number with eight divisors and multiple standard representations.