6644480 has 72 divisors (see below), whose sum is σ = 16556400. Its totient is φ = 2551808.

The previous prime is 6644459. The next prime is 6644483. The reversal of 6644480 is 844466.

It is a super-2 number, since 2×6644480² = 88298228940800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (6644483) 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, 37031 + ... + 37209.

It is an arithmetic number, because the mean of its divisors is an integer number (229950).

Almost surely, 2^6644480 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 6644480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8278200).

6644480 is an abundant number, since it is smaller than the sum of its proper divisors (9911920).

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

6644480 is a wasteful number, since it uses less digits than its factorization.

6644480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 6644480 is about 2577.6888873563. The cubic root of 6644480 is about 187.9981892085.

The spelling of 6644480 in words is "six million, six hundred forty-four thousand, four hundred eighty".