1644544 has 48 divisors (see below), whose sum is σ = 3636360. Its totient is φ = 737280.

The previous prime is 1644497. The next prime is 1644547. The reversal of 1644544 is 4454461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22492 + ... + 22564.

2^1644544 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 1644544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1818180).

1644544 is an abundant number, since it is smaller than the sum of its proper divisors (1991816).

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

1644544 is an equidigital number, since it uses as much as digits as its factorization.

1644544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106 (or 86 counting only the distinct ones).

The product of its digits is 7680, while the sum is 28.

The square root of 1644544 is about 1282.3977542089. The cubic root of 1644544 is about 118.0361853977.

The spelling of 1644544 in words is "one million, six hundred forty-four thousand, five hundred forty-four".