669610 has 16 divisors (see below), whose sum is σ = 1247400. Its totient is φ = 258496.

The previous prime is 669607. The next prime is 669611. The reversal of 669610 is 16966.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 622521 + 47089 = 789^2 + 217^2 .

It is not an unprimeable number, because it can be changed into a prime (669611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 865 + ... + 1444.

2⁶⁶⁹⁶¹⁰ is an apocalyptic number.

669610 is a deficient number, since it is larger than the sum of its proper divisors (577790).

669610 is a wasteful number, since it uses less digits than its factorization.

669610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2345.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 669610 is about 818.2970120928. The cubic root of 669610 is about 87.4864196611.

The spelling of 669610 in words is "six hundred sixty-nine thousand, six hundred ten".