663489 has 6 divisors (see below), whose sum is σ = 958386. Its totient is φ = 442320.

The previous prime is 663463. The next prime is 663517. The reversal of 663489 is 984366.

663489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 497025 + 166464 = 705^2 + 408^2 .

It is not a de Polignac number, because 663489 - 2¹⁷ = 532417 is a prime.

663489 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (663409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36852 + ... + 36869.

It is an arithmetic number, because the mean of its divisors is an integer number (159731).

2⁶⁶³⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

663489 is a deficient number, since it is larger than the sum of its proper divisors (294897).

663489 is a wasteful number, since it uses less digits than its factorization.

663489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73727 (or 73724 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 663489 is about 814.5483411069. The cubic root of 663489 is about 87.2190279857.

The spelling of 663489 in words is "six hundred sixty-three thousand, four hundred eighty-nine".