19109728 has 36 divisors (see below), whose sum is σ = 41219388. Its totient is φ = 8648960.

The previous prime is 19109689. The next prime is 19109747. The reversal of 19109728 is 82790191.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 81900 + ... + 82132.

It is an arithmetic number, because the mean of its divisors is an integer number (1144983).

Almost surely, 2^19109728 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 19109728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20609694).

19109728 is an abundant number, since it is smaller than the sum of its proper divisors (22109660).

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

19109728 is an equidigital number, since it uses as much as digits as its factorization.

19109728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487 (or 246 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 19109728 is about 4371.4674881554. The cubic root of 19109728 is about 267.3528605307.

The spelling of 19109728 in words is "nineteen million, one hundred nine thousand, seven hundred twenty-eight".