669868 has 12 divisors (see below), whose sum is σ = 1241352. Its totient is φ = 315200.

The previous prime is 669863. The next prime is 669869. The reversal of 669868 is 868966.

It is not an unprimeable number, because it can be changed into a prime (669863) by changing a digit.

669868 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, 4858 + ... + 4993.

It is an arithmetic number, because the mean of its divisors is an integer number (103446).

2⁶⁶⁹⁸⁶⁸ is an apocalyptic number.

669868 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

669868 is a deficient number, since it is larger than the sum of its proper divisors (571484).

669868 is a wasteful number, since it uses less digits than its factorization.

669868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9872 (or 9870 counting only the distinct ones).

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

The square root of 669868 is about 818.4546413822. The cubic root of 669868 is about 87.4976543589.

The spelling of 669868 in words is "six hundred sixty-nine thousand, eight hundred sixty-eight".