19728198 has 56 divisors (see below), whose sum is σ = 50732688. Its totient is φ = 5633712.

The previous prime is 19728197. The next prime is 19728209. The reversal of 19728198 is 89182791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19728197) by changing a digit.

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 27 ways as a sum of consecutive naturals, for example, 9240 + ... + 11172.

Almost surely, 2^19728198 is an apocalyptic number.

19728198 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19728198, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25366344).

19728198 is an abundant number, since it is smaller than the sum of its proper divisors (31004490).

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

19728198 is an equidigital number, since it uses as much as digits as its factorization.

19728198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1960 (or 1945 counting only the distinct ones).

The product of its digits is 72576, while the sum is 45.

The square root of 19728198 is about 4441.6436146994. The cubic root of 19728198 is about 270.2065086789.

The spelling of 19728198 in words is "nineteen million, seven hundred twenty-eight thousand, one hundred ninety-eight".