6639224 has 16 divisors (see below), whose sum is σ = 12489120. Its totient is φ = 3308800.

The previous prime is 6639223. The next prime is 6639233. The reversal of 6639224 is 4229366.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639223) 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, 1649 + ... + 3999.

It is an arithmetic number, because the mean of its divisors is an integer number (780570).

Almost surely, 2^6639224 is an apocalyptic number.

It is an amenable number.

6639224 is a deficient number, since it is larger than the sum of its proper divisors (5849896).

6639224 is a wasteful number, since it uses less digits than its factorization.

6639224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2710 (or 2706 counting only the distinct ones).

The product of its digits is 15552, while the sum is 32.

The square root of 6639224 is about 2576.6691677435. The cubic root of 6639224 is about 187.9486052359.

The spelling of 6639224 in words is "six million, six hundred thirty-nine thousand, two hundred twenty-four".