6643242 has 32 divisors (see below), whose sum is σ = 15111360. Its totient is φ = 2162160.

The previous prime is 6643229. The next prime is 6643249. The reversal of 6643242 is 2423466.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (6643249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 892 + ... + 3752.

It is an arithmetic number, because the mean of its divisors is an integer number (472230).

Almost surely, 2^6643242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6643242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7555680).

6643242 is an abundant number, since it is smaller than the sum of its proper divisors (8468118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6643242 is a wasteful number, since it uses less digits than its factorization.

6643242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2915 (or 2909 counting only the distinct ones).

The product of its digits is 6912, while the sum is 27.

The square root of 6643242 is about 2577.4487385785. The cubic root of 6643242 is about 187.9865125378.

The spelling of 6643242 in words is "six million, six hundred forty-three thousand, two hundred forty-two".