544640 has 64 divisors (see below), whose sum is σ = 1395360. Its totient is φ = 202752.

The previous prime is 544631. The next prime is 544651. The reversal of 544640 is 46445.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14702 + ... + 14738.

2⁵⁴⁴⁶⁴⁰ 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 544640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (697680).

544640 is an abundant number, since it is smaller than the sum of its proper divisors (850720).

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

544640 is a wasteful number, since it uses less digits than its factorization.

544640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 544640 is about 737.9972899679. The cubic root of 544640 is about 81.6651024736.

The spelling of 544640 in words is "five hundred forty-four thousand, six hundred forty".