669808 has 10 divisors (see below), whose sum is σ = 1297784. Its totient is φ = 334896.

The previous prime is 669791. The next prime is 669839. The reversal of 669808 is 808966.

It is a congruent number.

It is an unprimeable number.

669808 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 as a sum of consecutive naturals, namely, 20916 + ... + 20947.

2⁶⁶⁹⁸⁰⁸ is an apocalyptic number.

It is an amenable number.

669808 is a deficient number, since it is larger than the sum of its proper divisors (627976).

669808 is a wasteful number, since it uses less digits than its factorization.

669808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41871 (or 41865 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 669808 is about 818.4179861171. The cubic root of 669808 is about 87.4950418959.

The spelling of 669808 in words is "six hundred sixty-nine thousand, eight hundred eight".