6643120 has 40 divisors (see below), whose sum is σ = 16851600. Its totient is φ = 2415360.

The previous prime is 6643111. The next prime is 6643123. The reversal of 6643120 is 213466.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 6643091 and 6643100.

It is not an unprimeable number, because it can be changed into a prime (6643123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2895 + ... + 4654.

It is an arithmetic number, because the mean of its divisors is an integer number (421290).

Almost surely, 2^6643120 is an apocalyptic number.

It is an amenable number.

6643120 is an abundant number, since it is smaller than the sum of its proper divisors (10208480).

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

6643120 is a wasteful number, since it uses less digits than its factorization.

6643120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7573 (or 7567 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 6643120 is about 2577.4250716558. The cubic root of 6643120 is about 187.9853617696.

Adding to 6643120 its reverse (213466), we get a palindrome (6856586).

The spelling of 6643120 in words is "six million, six hundred forty-three thousand, one hundred twenty".