6623644 has 12 divisors (see below), whose sum is σ = 11641168. Its totient is φ = 3297600.

The previous prime is 6623611. The next prime is 6623707. The reversal of 6623644 is 4463266.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

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, 2472 + ... + 4399.

Almost surely, 2^6623644 is an apocalyptic number.

It is an amenable number.

6623644 is a deficient number, since it is larger than the sum of its proper divisors (5017524).

6623644 is a wasteful number, since it uses less digits than its factorization.

6623644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7116 (or 7114 counting only the distinct ones).

The product of its digits is 20736, while the sum is 31.

The square root of 6623644 is about 2573.6441090407. The cubic root of 6623644 is about 187.8014729412.

The spelling of 6623644 in words is "six million, six hundred twenty-three thousand, six hundred forty-four".