667289 has 4 divisors (see below), whose sum is σ = 762624. Its totient is φ = 571956.

The previous prime is 667283. The next prime is 667309. The reversal of 667289 is 982766.

667289 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 667289 - 2⁴ = 667273 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47657 + ... + 47670.

It is an arithmetic number, because the mean of its divisors is an integer number (190656).

2⁶⁶⁷²⁸⁹ is an apocalyptic number.

It is an amenable number.

667289 is a deficient number, since it is larger than the sum of its proper divisors (95335).

667289 is an equidigital number, since it uses as much as digits as its factorization.

667289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95334.

The product of its digits is 36288, while the sum is 38.

The square root of 667289 is about 816.8775918092. The cubic root of 667289 is about 87.3852209317.

The spelling of 667289 in words is "six hundred sixty-seven thousand, two hundred eighty-nine".