666836 has 12 divisors (see below), whose sum is σ = 1192128. Its totient is φ = 326232.

The previous prime is 666829. The next prime is 666857. The reversal of 666836 is 638666.

It is a junction number, because it is equal to n+sod(n) for n = 666796 and 666805.

It is a congruent number.

It is an unprimeable number.

666836 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, 1586 + ... + 1961.

It is an arithmetic number, because the mean of its divisors is an integer number (99344).

2⁶⁶⁶⁸³⁶ is an apocalyptic number.

It is an amenable number.

666836 is a deficient number, since it is larger than the sum of its proper divisors (525292).

666836 is a wasteful number, since it uses less digits than its factorization.

666836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3598 (or 3596 counting only the distinct ones).

The product of its digits is 31104, while the sum is 35.

The square root of 666836 is about 816.6002694097. The cubic root of 666836 is about 87.3654421621.

The spelling of 666836 in words is "six hundred sixty-six thousand, eight hundred thirty-six".