666936 has 48 divisors (see below), whose sum is σ = 1848600. Its totient is φ = 217152.

The previous prime is 666929. The next prime is 666937. The reversal of 666936 is 639666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 666936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666937) by changing a digit.

666936 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 11 ways as a sum of consecutive naturals, for example, 4170 + ... + 4326.

2⁶⁶⁶⁹³⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (924300).

666936 is an abundant number, since it is smaller than the sum of its proper divisors (1181664).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666936 is a wasteful number, since it uses less digits than its factorization.

666936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228 (or 221 counting only the distinct ones).

The product of its digits is 34992, while the sum is 36.

The square root of 666936 is about 816.6614965823. The cubic root of 666936 is about 87.3698091067.

The spelling of 666936 in words is "six hundred sixty-six thousand, nine hundred thirty-six".