6643912 has 32 divisors (see below), whose sum is σ = 13740480. Its totient is φ = 2986560.

The previous prime is 6643909. The next prime is 6643919. The reversal of 6643912 is 2193466.

It is not an unprimeable number, because it can be changed into a prime (6643919) 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, 8698 + ... + 9430.

It is an arithmetic number, because the mean of its divisors is an integer number (429390).

Almost surely, 2^6643912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6643912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6870240).

6643912 is an abundant number, since it is smaller than the sum of its proper divisors (7096568).

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

6643912 is a wasteful number, since it uses less digits than its factorization.

6643912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853 (or 849 counting only the distinct ones).

The product of its digits is 7776, while the sum is 31.

The square root of 6643912 is about 2577.5787087885. The cubic root of 6643912 is about 187.9928320792.

The spelling of 6643912 in words is "six million, six hundred forty-three thousand, nine hundred twelve".