6543644 has 12 divisors (see below), whose sum is σ = 11613168. Its totient is φ = 3225600.

The previous prime is 6543643. The next prime is 6543659. The reversal of 6543644 is 4463456.

It is a self number, because there is not a number n which added to its sum of digits gives 6543644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6543643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11237 + ... + 11804.

It is an arithmetic number, because the mean of its divisors is an integer number (967764).

Almost surely, 2^6543644 is an apocalyptic number.

It is an amenable number.

6543644 is a deficient number, since it is larger than the sum of its proper divisors (5069524).

6543644 is a wasteful number, since it uses less digits than its factorization.

6543644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23116 (or 23114 counting only the distinct ones).

The product of its digits is 34560, while the sum is 32.

The square root of 6543644 is about 2558.0547296725. The cubic root of 6543644 is about 187.0423231532.

The spelling of 6543644 in words is "six million, five hundred forty-three thousand, six hundred forty-four".