Adding to 68621 its sum of digits (23), we get a square (68644 = 2622).
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12686 = 2 ⋅6343.
It is a cyclic number.
It is a Duffinian number.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 68621.
268621 is an apocalyptic number.
It is an amenable number.
68621 is an equidigital number, since it uses as much as digits as its factorization.
68621 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 9810.
The square root of 68621 is about 261.9561031929. The cubic root of 68621 is about 40.9404250770.
The spelling of 68621 in words is "sixty-eight thousand, six hundred twenty-one".