16544440 has 64 divisors (see below), whose sum is σ = 42768000. Its totient is φ = 5696640.

The previous prime is 16544431. The next prime is 16544453. The reversal of 16544440 is 4444561.

It is a junction number, because it is equal to n+sod(n) for n = 16544399 and 16544408.

It is a congruent number.

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, 7371 + ... + 9349.

It is an arithmetic number, because the mean of its divisors is an integer number (668250).

Almost surely, 2^16544440 is an apocalyptic number.

16544440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16544440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21384000).

16544440 is an abundant number, since it is smaller than the sum of its proper divisors (26223560).

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

16544440 is a wasteful number, since it uses less digits than its factorization.

16544440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2020 (or 2016 counting only the distinct ones).

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

The square root of 16544440 is about 4067.4857098704. The cubic root of 16544440 is about 254.8105218085.

The spelling of 16544440 in words is "sixteen million, five hundred forty-four thousand, four hundred forty".