658 is nontrivially palindromic in base 16.
658 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.
It is a sphenic number, since it is the product of 3 distinct primes.
It is an alternating number because its digits alternate between even and odd.
658 is an undulating number in base 16.
It is a plaindrome in base 8, base 12 and base 15.
It is a nialpdrome in base 9.
It is a congruent number.
658 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
658 is a wasteful number, since it uses less digits than its factorization.
658 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 56.
The square root of 658 is about 25.6515106768. The cubic root of 658 is about 8.6977842598.
Adding to 658 its product of digits (240), we get a palindrome (898).