664289 has 2 divisors, whose sum is σ = 664290. Its totient is φ = 664288.

The previous prime is 664273. The next prime is 664319. The reversal of 664289 is 982466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 664225 + 64 = 815^2 + 8^2 .

It is a cyclic number.

It is not a de Polignac number, because 664289 - 2⁴ = 664273 is a prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 6³ + 6⁴ + 2¹⁷ + 4⁴ + 8 + 9⁶ .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664289.

It is not a weakly prime, because it can be changed into another prime (664589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332144 + 332145.

It is an arithmetic number, because the mean of its divisors is an integer number (332145).

2⁶⁶⁴²⁸⁹ is an apocalyptic number.

It is an amenable number.

664289 is a deficient number, since it is larger than the sum of its proper divisors (1).

664289 is an equidigital number, since it uses as much as digits as its factorization.

664289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 35.

The square root of 664289 is about 815.0392628579. The cubic root of 664289 is about 87.2540686055.

The spelling of 664289 in words is "six hundred sixty-four thousand, two hundred eighty-nine".