669668 has 24 divisors (see below), whose sum is σ = 1270080. Its totient is φ = 308000.

The previous prime is 669667. The next prime is 669673. The reversal of 669668 is 866966.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669661) 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, 2543 + ... + 2793.

It is an arithmetic number, because the mean of its divisors is an integer number (52920).

2⁶⁶⁹⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

669668 is a deficient number, since it is larger than the sum of its proper divisors (600412).

669668 is a wasteful number, since it uses less digits than its factorization.

669668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307 (or 305 counting only the distinct ones).

The product of its digits is 93312, while the sum is 41.

The square root of 669668 is about 818.3324507802. The cubic root of 669668 is about 87.4889455423.

The spelling of 669668 in words is "six hundred sixty-nine thousand, six hundred sixty-eight".