662689 has 2 divisors, whose sum is σ = 662690. Its totient is φ = 662688.

The previous prime is 662681. The next prime is 662693. The reversal of 662689 is 986266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 608400 + 54289 = 780^2 + 233^2 .

It is a cyclic number.

It is not a de Polignac number, because 662689 - 2³ = 662681 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (662681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331344 + 331345.

It is an arithmetic number, because the mean of its divisors is an integer number (331345).

2⁶⁶²⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

662689 is a deficient number, since it is larger than the sum of its proper divisors (1).

662689 is an equidigital number, since it uses as much as digits as its factorization.

662689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 37.

The square root of 662689 is about 814.0571233028. The cubic root of 662689 is about 87.1839591878.

The spelling of 662689 in words is "six hundred sixty-two thousand, six hundred eighty-nine".