6644560 has 40 divisors (see below), whose sum is σ = 16639560. Its totient is φ = 2452992.

The previous prime is 6644551. The next prime is 6644579. The reversal of 6644560 is 654466.

It can be written as a sum of positive squares in 4 ways, for example, as 374544 + 6270016 = 612^2 + 2504^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2155 + ... + 4234.

It is an arithmetic number, because the mean of its divisors is an integer number (415989).

Almost surely, 2^6644560 is an apocalyptic number.

It is an amenable number.

6644560 is an abundant number, since it is smaller than the sum of its proper divisors (9995000).

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

6644560 is a wasteful number, since it uses less digits than its factorization.

6644560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6415 (or 6409 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 6644560 is about 2577.7044050860. The cubic root of 6644560 is about 187.9989437092.

The spelling of 6644560 in words is "six million, six hundred forty-four thousand, five hundred sixty".