19719828 has 48 divisors (see below), whose sum is σ = 51495360. Its totient is φ = 6525792.

The previous prime is 19719803. The next prime is 19719839. The reversal of 19719828 is 82891791.

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, 16375 + ... + 17537.

It is an arithmetic number, because the mean of its divisors is an integer number (1072820).

Almost surely, 2^19719828 is an apocalyptic number.

19719828 is a gapful number since it is divisible by the number (18) 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 19719828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25747680).

19719828 is an abundant number, since it is smaller than the sum of its proper divisors (31775532).

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

19719828 is a wasteful number, since it uses less digits than its factorization.

19719828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333 (or 1325 counting only the distinct ones).

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

The square root of 19719828 is about 4440.7012959667. The cubic root of 19719828 is about 270.1682901452.

The spelling of 19719828 in words is "nineteen million, seven hundred nineteen thousand, eight hundred twenty-eight".