数字属性计算器
检查数字是否为质数、偶数、完全数等
公式
Check primality, parity, perfection
A perfect number equals the sum of its proper divisors (e.g., 6 = 1+2+3).
示例
28
Not prime, even, perfect number (1+2+4+7+14=28).
常见问题
关于 数字属性计算器
Check if a number is prime, even, perfect, and find its divisors.