128563881908 has 144 divisors (see below), whose sum is σ = 298391071104. Its totient is φ = 47837180160.

The previous prime is 128563881899. The next prime is 128563881923. The reversal of 128563881908 is 809188365821.

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, 39520010 + ... + 39523262.

It is an arithmetic number, because the mean of its divisors is an integer number (2072160216).

Almost surely, 2^128563881908 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 128563881908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149195535552).

128563881908 is an abundant number, since it is smaller than the sum of its proper divisors (169827189196).

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

128563881908 is a wasteful number, since it uses less digits than its factorization.

128563881908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4102 (or 4093 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 59.

The spelling of 128563881908 in words is "one hundred twenty-eight billion, five hundred sixty-three million, eight hundred eighty-one thousand, nine hundred eight".