666876 has 48 divisors (see below), whose sum is σ = 1886976. Its totient is φ = 178944.

The previous prime is 666871. The next prime is 666889. The reversal of 666876 is 678666.

666876 = T₄₃₃ + T₄₃₄ + ... + T₄₃₉.

666876 = 190² + 191² + ... + 206².

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666871) by changing a digit.

666876 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 15 ways as a sum of consecutive naturals, for example, 1195 + ... + 1661.

It is an arithmetic number, because the mean of its divisors is an integer number (39312).

2⁶⁶⁶⁸⁷⁶ 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 666876, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (943488).

666876 is an abundant number, since it is smaller than the sum of its proper divisors (1220100).

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

666876 is a wasteful number, since it uses less digits than its factorization.

666876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498 (or 496 counting only the distinct ones).

The product of its digits is 72576, while the sum is 39.

The square root of 666876 is about 816.6247608296. The cubic root of 666876 is about 87.3671889923.

The spelling of 666876 in words is "six hundred sixty-six thousand, eight hundred seventy-six".