669886 has 16 divisors (see below), whose sum is σ = 1169280. Its totient is φ = 281880.

The previous prime is 669869. The next prime is 669887. The reversal of 669886 is 688966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669887) 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, 421 + ... + 1231.

It is an arithmetic number, because the mean of its divisors is an integer number (73080).

2⁶⁶⁹⁸⁸⁶ is an apocalyptic number.

669886 is a deficient number, since it is larger than the sum of its proper divisors (499394).

669886 is a wasteful number, since it uses less digits than its factorization.

669886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879.

The product of its digits is 124416, while the sum is 43.

The square root of 669886 is about 818.4656376416. The cubic root of 669886 is about 87.4984380674.

The spelling of 669886 in words is "six hundred sixty-nine thousand, eight hundred eighty-six".