669976 has 16 divisors (see below), whose sum is σ = 1272600. Its totient is φ = 330624.

The previous prime is 669971. The next prime is 669989. The reversal of 669976 is 679966.

It is a happy number.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160 + ... + 1168.

2⁶⁶⁹⁹⁷⁶ is an apocalyptic number.

It is an amenable number.

669976 is a deficient number, since it is larger than the sum of its proper divisors (602624).

669976 is a wasteful number, since it uses less digits than its factorization.

669976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1098 (or 1094 counting only the distinct ones).

The product of its digits is 122472, while the sum is 43.

The square root of 669976 is about 818.5206167226. The cubic root of 669976 is about 87.5023563991.

The spelling of 669976 in words is "six hundred sixty-nine thousand, nine hundred seventy-six".