669876 has 12 divisors (see below), whose sum is σ = 1563072. Its totient is φ = 223288.

The previous prime is 669869. The next prime is 669887. The reversal of 669876 is 678966.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 669876.

It is an unprimeable number.

669876 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27900 + ... + 27923.

It is an arithmetic number, because the mean of its divisors is an integer number (130256).

2⁶⁶⁹⁸⁷⁶ is an apocalyptic number.

It is an amenable number.

669876 is an abundant number, since it is smaller than the sum of its proper divisors (893196).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669876 is a wasteful number, since it uses less digits than its factorization.

669876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55830 (or 55828 counting only the distinct ones).

The product of its digits is 108864, while the sum is 42.

The square root of 669876 is about 818.4595286268. The cubic root of 669876 is about 87.4980026755.

The spelling of 669876 in words is "six hundred sixty-nine thousand, eight hundred seventy-six".