5578

5578 is a natural number that follows 5577 and precedes 5579. It is an even, composite value whose factorization is 2 × 2789, with 2789 being a prime number. Because it is the product of two primes, 5578 is classified as a semiprime. It is not a prime, nor a perfect square or cube.

The sum of its decimal digits is 25, giving a digital root of 7. Consequently, 5578 is not a Harshad number, since it is not divisible by 25. In modular arithmetic, 5578 ≡ 1 (mod 11) and ≡ 6 (mod 7); it is also ≡ 2 (mod 4) and ≡ 7 (mod 9).

Representations in other bases include hexadecimal, binary, and octal. In hexadecimal, 5578 equals 0x15CA. In binary, it is 1010111001010. In octal, it is 12712 (that is, 1-2-7-1-2 in base 8).

Notes on arithmetic properties: since 5578 = 2 × 2789 and 2789 is prime, its divisors are 1, 2, 2789, and 5578. The number is not commonly cited for special sequences or notable theorems beyond its basic factorization and base representations.