19111311828 has 144 divisors (see below), whose sum is σ = 58054180800. Its totient is φ = 5420882880.

The previous prime is 19111311811. The next prime is 19111311833. The reversal of 19111311828 is 82811311191.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 19111311792 and 19111311801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 722598 + ... + 748578.

Almost surely, 2^19111311828 is an apocalyptic number.

19111311828 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 19111311828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29027090400).

19111311828 is an abundant number, since it is smaller than the sum of its proper divisors (38942868972).

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

19111311828 is a wasteful number, since it uses less digits than its factorization.

19111311828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26147 (or 26132 counting only the distinct ones).

The product of its digits is 3456, while the sum is 36.

The spelling of 19111311828 in words is "nineteen billion, one hundred eleven million, three hundred eleven thousand, eight hundred twenty-eight".