663280 has 20 divisors (see below), whose sum is σ = 1542312. Its totient is φ = 265280.

The previous prime is 663269. The next prime is 663281. The reversal of 663280 is 82366.

663280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663281) by changing a digit.

663280 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4066 + ... + 4225.

2⁶⁶³²⁸⁰ is an apocalyptic number.

It is an amenable number.

663280 is an abundant number, since it is smaller than the sum of its proper divisors (879032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

663280 is a wasteful number, since it uses less digits than its factorization.

663280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8304 (or 8298 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 663280 is about 814.4200390462. The cubic root of 663280 is about 87.2098689837.

The spelling of 663280 in words is "six hundred sixty-three thousand, two hundred eighty".