6643438 has 8 divisors (see below), whose sum is σ = 10101888. Its totient is φ = 3276144.

The previous prime is 6643423. The next prime is 6643453. The reversal of 6643438 is 8343466.

It is an interprime number because it is at equal distance from previous prime (6643423) and next prime (6643453).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a d-powerful number, because it can be written as 6⁷ + 6⁷ + 4⁹ + 3³ + 4¹¹ + 3¹³ + 8⁵ .

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, 22606 + ... + 22897.

It is an arithmetic number, because the mean of its divisors is an integer number (1262736).

Almost surely, 2^6643438 is an apocalyptic number.

6643438 is a deficient number, since it is larger than the sum of its proper divisors (3458450).

6643438 is a wasteful number, since it uses less digits than its factorization.

6643438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45578.

The product of its digits is 41472, while the sum is 34.

The square root of 6643438 is about 2577.4867603928. The cubic root of 6643438 is about 187.9883612834.

The spelling of 6643438 in words is "six million, six hundred forty-three thousand, four hundred thirty-eight".