128049105520 has 80 divisors (see below), whose sum is σ = 342211757760. Its totient is φ = 43648745472.

The previous prime is 128049105467. The next prime is 128049105523. The reversal of 128049105520 is 25501940821.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 128049105520.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128049105523) 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, 563985 + ... + 757744.

It is an arithmetic number, because the mean of its divisors is an integer number (4277646972).

Almost surely, 2^128049105520 is an apocalyptic number.

128049105520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128049105520 is an abundant number, since it is smaller than the sum of its proper divisors (214162652240).

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

128049105520 is a wasteful number, since it uses less digits than its factorization.

128049105520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321922 (or 1321916 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 37.

The spelling of 128049105520 in words is "one hundred twenty-eight billion, forty-nine million, one hundred five thousand, five hundred twenty".