19728156 has 96 divisors (see below), whose sum is σ = 56770560. Its totient is φ = 5206464.

The previous prime is 19728139. The next prime is 19728161. The reversal of 19728156 is 65182791.

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 31 ways as a sum of consecutive naturals, for example, 74881 + ... + 75143.

It is an arithmetic number, because the mean of its divisors is an integer number (591360).

Almost surely, 2^19728156 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 19728156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28385280).

19728156 is an abundant number, since it is smaller than the sum of its proper divisors (37042404).

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

19728156 is a wasteful number, since it uses less digits than its factorization.

19728156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343 (or 341 counting only the distinct ones).

The product of its digits is 30240, while the sum is 39.

The square root of 19728156 is about 4441.6388867174. The cubic root of 19728156 is about 270.2063169283.

The spelling of 19728156 in words is "nineteen million, seven hundred twenty-eight thousand, one hundred fifty-six".