128896399644 has 48 divisors (see below), whose sum is σ = 311343715200. Its totient is φ = 41455302336.

The previous prime is 128896399637. The next prime is 128896399757. The reversal of 128896399644 is 446993698821.

128896399644 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×128896399644³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

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, 380799 + ... + 634665.

It is an arithmetic number, because the mean of its divisors is an integer number (6486327400).

Almost surely, 2^128896399644 is an apocalyptic number.

It is an amenable number.

128896399644 is an abundant number, since it is smaller than the sum of its proper divisors (182447315556).

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

128896399644 is a wasteful number, since it uses less digits than its factorization.

128896399644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255362 (or 255360 counting only the distinct ones).

The product of its digits is 161243136, while the sum is 69.

The spelling of 128896399644 in words is "one hundred twenty-eight billion, eight hundred ninety-six million, three hundred ninety-nine thousand, six hundred forty-four".