665280 divided by its product of nonzero digits (2880) gives a triangular number (231 = T21).
665280 is a `hidden beast` number, since 6 + 652 + 8 + 0 = 666.
It is a tau number, because it is divible by the number of its divisors (224).
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 665280.
It is an unprimeable number.
665280 is a highly composite number, because it has more divisors than any smaller number.
665280 is a superabundant number, because it has a larger abundancy index than any smaller number.
2665280 is an apocalyptic number.
665280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 665280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1463040).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
665280 is a wasteful number, since it uses less digits than its factorization.
665280 is an odious number, because the sum of its binary digits is odd.
The square root of 665280 is about 815.6469824624. The cubic root of 665280 is about 87.2974361855.
The spelling of 665280 in words is "six hundred sixty-five thousand, two hundred eighty".