664280 has 16 divisors (see below), whose sum is σ = 1494720. Its totient is φ = 265696.

The previous prime is 664273. The next prime is 664289. The reversal of 664280 is 82466.

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 664280.

It is not an unprimeable number, because it can be changed into a prime (664289) by changing a digit.

664280 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, 8264 + ... + 8343.

It is an arithmetic number, because the mean of its divisors is an integer number (93420).

2⁶⁶⁴²⁸⁰ is an apocalyptic number.

It is an amenable number.

664280 is an abundant number, since it is smaller than the sum of its proper divisors (830440).

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

664280 is a wasteful number, since it uses less digits than its factorization.

664280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16618 (or 16614 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 664280 is about 815.0337416328. The cubic root of 664280 is about 87.2536745551.

The spelling of 664280 in words is "six hundred sixty-four thousand, two hundred eighty".