665676 has 54 divisors (see below), whose sum is σ = 1881516. Its totient is φ = 196800.

The previous prime is 665659. The next prime is 665677. The reversal of 665676 is 676566.

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

It is a self number, because there is not a number n which added to its sum of digits gives 665676.

It is not an unprimeable number, because it can be changed into a prime (665677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 16216 + ... + 16256.

2⁶⁶⁵⁶⁷⁶ is an apocalyptic number.

665676 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665676, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (940758).

665676 is an abundant number, since it is smaller than the sum of its proper divisors (1215840).

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

665676 is a wasteful number, since it uses less digits than its factorization.

665676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103 (or 57 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 665676 is about 815.8896984274. The cubic root of 665676 is about 87.3147536698.

The spelling of 665676 in words is "six hundred sixty-five thousand, six hundred seventy-six".