6644448 has 36 divisors (see below), whose sum is σ = 18895968. Its totient is φ = 2214720.

The previous prime is 6644441. The next prime is 6644459. The reversal of 6644448 is 8444466.

6644448 is a `hidden beast` number, since 6 + 644 + 4 + 4 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6644441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11248 + ... + 11823.

It is an arithmetic number, because the mean of its divisors is an integer number (524888).

Almost surely, 2^6644448 is an apocalyptic number.

It is an amenable number.

6644448 is an abundant number, since it is smaller than the sum of its proper divisors (12251520).

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

6644448 is a wasteful number, since it uses less digits than its factorization.

6644448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23087 (or 23076 counting only the distinct ones).

The product of its digits is 73728, while the sum is 36.

The square root of 6644448 is about 2577.6826802382. The cubic root of 6644448 is about 187.9978874065.

Adding to 6644448 its product of digits (73728), we get a palindrome (6718176).

The spelling of 6644448 in words is "six million, six hundred forty-four thousand, four hundred forty-eight".