19113438784 has 84 divisors (see below), whose sum is σ = 43127790300. Its totient is φ = 8388244480.

The previous prime is 19113438767. The next prime is 19113438791. The reversal of 19113438784 is 48783431191.

It can be written as a sum of positive squares in 2 ways, for example, as 9049336384 + 10064102400 = 95128^2 + 100320^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 182022 + ... + 267130.

It is an arithmetic number, because the mean of its divisors is an integer number (513426075).

Almost surely, 2^19113438784 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 19113438784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21563895150).

19113438784 is an abundant number, since it is smaller than the sum of its proper divisors (24014351516).

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

19113438784 is a wasteful number, since it uses less digits than its factorization.

19113438784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85172 (or 85151 counting only the distinct ones).

The product of its digits is 580608, while the sum is 49.

The spelling of 19113438784 in words is "nineteen billion, one hundred thirteen million, four hundred thirty-eight thousand, seven hundred eighty-four".