19781411328 has 960 divisors, whose sum is σ = 75571056000. Its totient is φ = 5072191488.

The previous prime is 19781411267. The next prime is 19781411339. The reversal of 19781411328 is 82311418791.

It is a happy number.

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 373234150 + ... + 373234202.

It is an arithmetic number, because the mean of its divisors is an integer number (78719850).

Almost surely, 2^19781411328 is an apocalyptic number.

19781411328 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 19781411328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37785528000).

19781411328 is an abundant number, since it is smaller than the sum of its proper divisors (55789644672).

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

19781411328 is a wasteful number, since it uses less digits than its factorization.

19781411328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142 (or 113 counting only the distinct ones).

The product of its digits is 96768, while the sum is 45.

The spelling of 19781411328 in words is "nineteen billion, seven hundred eighty-one million, four hundred eleven thousand, three hundred twenty-eight".