19538049128 has 64 divisors (see below), whose sum is σ = 40874274000. Its totient is φ = 8693379072.

The previous prime is 19538049059. The next prime is 19538049133. The reversal of 19538049128 is 82194083591.

It can be written as a sum of positive squares in 8 ways, for example, as 60497284 + 19477551844 = 7778^2 + 139562^2 .

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, 2133776 + ... + 2142912.

Almost surely, 2^19538049128 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 19538049128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20437137000).

19538049128 is an abundant number, since it is smaller than the sum of its proper divisors (21336224872).

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

19538049128 is a wasteful number, since it uses less digits than its factorization.

19538049128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9894 (or 9890 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 50.

The spelling of 19538049128 in words is "nineteen billion, five hundred thirty-eight million, forty-nine thousand, one hundred twenty-eight".