6668644 has 24 divisors (see below), whose sum is σ = 11995200. Its totient is φ = 3242976.

The previous prime is 6668617. The next prime is 6668659. The reversal of 6668644 is 4468666.

It is a junction number, because it is equal to n+sod(n) for n = 6668597 and 6668606.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39849 + ... + 40015.

It is an arithmetic number, because the mean of its divisors is an integer number (499800).

Almost surely, 2^6668644 is an apocalyptic number.

It is an amenable number.

6668644 is a deficient number, since it is larger than the sum of its proper divisors (5326556).

6668644 is a wasteful number, since it uses less digits than its factorization.

6668644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387 (or 385 counting only the distinct ones).

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

The square root of 6668644 is about 2582.3717780366. The cubic root of 6668644 is about 188.2258113559.

The spelling of 6668644 in words is "six million, six hundred sixty-eight thousand, six hundred forty-four".