16445728 has 36 divisors (see below), whose sum is σ = 35071218. Its totient is φ = 7587840.

The previous prime is 16445699. The next prime is 16445731. The reversal of 16445728 is 82754461.

16445728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 13162384 + 3283344 = 3628^2 + 1812^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3888 + ... + 6928.

Almost surely, 2^16445728 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 16445728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17535609).

16445728 is an abundant number, since it is smaller than the sum of its proper divisors (18625490).

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

16445728 is a wasteful number, since it uses less digits than its factorization.

16445728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3077 (or 3056 counting only the distinct ones).

The product of its digits is 53760, while the sum is 37.

The square root of 16445728 is about 4055.3332785358. Note that the first 3 decimals coincide. The cubic root of 16445728 is about 254.3027369707.

The spelling of 16445728 in words is "sixteen million, four hundred forty-five thousand, seven hundred twenty-eight".