6644680 has 64 divisors (see below), whose sum is σ = 18000000. Its totient is φ = 2156544.

The previous prime is 6644647. The next prime is 6644681. The reversal of 6644680 is 864466.

It is not an unprimeable number, because it can be changed into a prime (6644681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4696 + ... + 5944.

It is an arithmetic number, because the mean of its divisors is an integer number (281250).

Almost surely, 2^6644680 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 6644680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9000000).

6644680 is an abundant number, since it is smaller than the sum of its proper divisors (11355320).

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

6644680 is a wasteful number, since it uses less digits than its factorization.

6644680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286 (or 1282 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 6644680 is about 2577.7276815056. The cubic root of 6644680 is about 188.0000754489. Note that the first 4 decimals are identical.

The spelling of 6644680 in words is "six million, six hundred forty-four thousand, six hundred eighty".