128111520 has 48 divisors (see below), whose sum is σ = 403552800. Its totient is φ = 34162944.

The previous prime is 128111497. The next prime is 128111521. The reversal of 128111520 is 25111821.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (128111521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132970 + ... + 133929.

It is an arithmetic number, because the mean of its divisors is an integer number (8407350).

Almost surely, 2^128111520 is an apocalyptic number.

128111520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128111520 is an abundant number, since it is smaller than the sum of its proper divisors (275441280).

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

128111520 is a wasteful number, since it uses less digits than its factorization.

128111520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266917 (or 266909 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 21.

The square root of 128111520 is about 11318.6359602206. The cubic root of 128111520 is about 504.1147383015.

The spelling of 128111520 in words is "one hundred twenty-eight million, one hundred eleven thousand, five hundred twenty".