128034321520 has 80 divisors (see below), whose sum is σ = 340264793088. Its totient is φ = 43889829120.

The previous prime is 128034321491. The next prime is 128034321529. The reversal of 128034321520 is 25123430821.

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

It is a super-2 number, since 2×128034321520² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128034321529) 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, 3873865 + ... + 3906775.

Almost surely, 2^128034321520 is an apocalyptic number.

128034321520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128034321520 is an abundant number, since it is smaller than the sum of its proper divisors (212230471568).

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

128034321520 is a wasteful number, since it uses less digits than its factorization.

128034321520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39878 (or 39872 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 128034321520 in words is "one hundred twenty-eight billion, thirty-four million, three hundred twenty-one thousand, five hundred twenty".