679966 has 16 divisors (see below), whose sum is σ = 1234656. Its totient is φ = 274176.

The previous prime is 679961. The next prime is 679969. The reversal of 679966 is 669976.

It is a happy number.

It is a super-2 number, since 2×679966² = 924707522312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1191 + ... + 1666.

It is an arithmetic number, because the mean of its divisors is an integer number (77166).

2⁶⁷⁹⁹⁶⁶ is an apocalyptic number.

679966 is a deficient number, since it is larger than the sum of its proper divisors (554690).

679966 is a wasteful number, since it uses less digits than its factorization.

679966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2883.

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

The square root of 679966 is about 824.6005093377. The cubic root of 679966 is about 87.9351278088.

The spelling of 679966 in words is "six hundred seventy-nine thousand, nine hundred sixty-six".