660289 has 4 divisors (see below), whose sum is σ = 754624. Its totient is φ = 565956.

The previous prime is 660281. The next prime is 660299. The reversal of 660289 is 982066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 660289 - 2³ = 660281 is a prime.

It is a Duffinian number.

660289 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 660289.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 660289.

It is not an unprimeable number, because it can be changed into a prime (660281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47157 + ... + 47170.

It is an arithmetic number, because the mean of its divisors is an integer number (188656).

2⁶⁶⁰²⁸⁹ is an apocalyptic number.

It is an amenable number.

660289 is a deficient number, since it is larger than the sum of its proper divisors (94335).

660289 is an equidigital number, since it uses as much as digits as its factorization.

660289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94334.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 660289 is about 812.5816882013. The cubic root of 660289 is about 87.0785831575.

It can be divided in two parts, 660 and 289, that added together give a palindrome (949).

The spelling of 660289 in words is "six hundred sixty thousand, two hundred eighty-nine".