6644364 has 48 divisors (see below), whose sum is σ = 16353120. Its totient is φ = 2096640.

The previous prime is 6644359. The next prime is 6644371. The reversal of 6644364 is 4634466.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21072 + ... + 21384.

It is an arithmetic number, because the mean of its divisors is an integer number (340690).

Almost surely, 2^6644364 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 6644364, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8176560).

6644364 is an abundant number, since it is smaller than the sum of its proper divisors (9708756).

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

6644364 is a wasteful number, since it uses less digits than its factorization.

6644364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410 (or 408 counting only the distinct ones).

The product of its digits is 41472, while the sum is 33.

The square root of 6644364 is about 2577.6663864822. Note that the first 3 decimals coincide. The cubic root of 6644364 is about 187.9970951717.

The spelling of 6644364 in words is "six million, six hundred forty-four thousand, three hundred sixty-four".