128639518848 has 384 divisors, whose sum is σ = 407999592000. Its totient is φ = 40230162432.

The previous prime is 128639518837. The next prime is 128639518877. The reversal of 128639518848 is 848815936821.

128639518848 is a `hidden beast` number, since 1 + 2 + 8 + 6 + 39 + 518 + 84 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

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, 64415386 + ... + 64417382.

Almost surely, 2^128639518848 is an apocalyptic number.

128639518848 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 128639518848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203999796000).

128639518848 is an abundant number, since it is smaller than the sum of its proper divisors (279360073152).

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

128639518848 is a wasteful number, since it uses less digits than its factorization.

128639518848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2154 (or 2130 counting only the distinct ones).

The product of its digits is 26542080, while the sum is 63.

The spelling of 128639518848 in words is "one hundred twenty-eight billion, six hundred thirty-nine million, five hundred eighteen thousand, eight hundred forty-eight".