128711044640 has 48 divisors (see below), whose sum is σ = 321966899352. Its totient is φ = 48455921664.

The previous prime is 128711044639. The next prime is 128711044697. The reversal of 128711044640 is 46440117821.

128711044640 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 127411874704 + 1299169936 = 356948^2 + 36044^2 .

It is a junction number, because it is equal to n+sod(n) for n = 128711044594 and 128711044603.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23657399 + ... + 23662838.

Almost surely, 2^128711044640 is an apocalyptic number.

128711044640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128711044640 is an abundant number, since it is smaller than the sum of its proper divisors (193255854712).

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

128711044640 is a wasteful number, since it uses less digits than its factorization.

128711044640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47320269 (or 47320261 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 38.

The spelling of 128711044640 in words is "one hundred twenty-eight billion, seven hundred eleven million, forty-four thousand, six hundred forty".