It is a nialpdrome in base 4 and base 16.
It is a zygodrome in base 4.
It is an unprimeable number.
In principle, a polygon with 655360 sides can be constructed with ruler and compass.
2655360 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 655360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (786429).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
655360 is an frugal number, since it uses more digits than its factorization.
655360 is an evil number, because the sum of its binary digits is even.
The square root of 655360 is about 809.5430810031. The cubic root of 655360 is about 86.8613637310.
The spelling of 655360 in words is "six hundred fifty-five thousand, three hundred sixty".