8666644 has 12 divisors (see below), whose sum is σ = 17333344. Its totient is φ = 3714264.

The previous prime is 8666627. The next prime is 8666681. The reversal of 8666644 is 4466668.

8666644 is an admirable number.

It is a super-2 number, since 2×8666644² = 150221436445472, which contains 22 as substring.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 8666597 and 8666606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154734 + ... + 154789.

Almost surely, 2^8666644 is an apocalyptic number.

It is an amenable number.

8666644 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

8666644 is a wasteful number, since it uses less digits than its factorization.

8666644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309534 (or 309532 counting only the distinct ones).

The product of its digits is 165888, while the sum is 40.

The square root of 8666644 is about 2943.9164390315. The cubic root of 8666644 is about 205.4078258512.

It can be divided in two parts, 866664 and 4, that added together give a palindrome (866668).

The spelling of 8666644 in words is "eight million, six hundred sixty-six thousand, six hundred forty-four".