128398649568 has 96 divisors (see below), whose sum is σ = 386360352000. Its totient is φ = 36574433280.

The previous prime is 128398649557. The next prime is 128398649569. The reversal of 128398649568 is 865946893821.

128398649568 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128398649569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66193 + ... + 511056.

It is an arithmetic number, because the mean of its divisors is an integer number (4024587000).

Almost surely, 2^128398649568 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 128398649568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (193180176000).

128398649568 is an abundant number, since it is smaller than the sum of its proper divisors (257961702432).

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

128398649568 is a wasteful number, since it uses less digits than its factorization.

128398649568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577600 (or 577592 counting only the distinct ones).

The product of its digits is 179159040, while the sum is 69.

The spelling of 128398649568 in words is "one hundred twenty-eight billion, three hundred ninety-eight million, six hundred forty-nine thousand, five hundred sixty-eight".