128539923120 has 240 divisors, whose sum is σ = 494470708992. Its totient is φ = 29313722880.

The previous prime is 128539923079. The next prime is 128539923121. The reversal of 128539923120 is 21329935821.

128539923120 is a `hidden beast` number, since 1 + 2 + 8 + 5 + 399 + 231 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (128539923121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2203935 + ... + 2261505.

Almost surely, 2^128539923120 is an apocalyptic number.

128539923120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128539923120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247235354496).

128539923120 is an abundant number, since it is smaller than the sum of its proper divisors (365930785872).

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

128539923120 is a wasteful number, since it uses less digits than its factorization.

128539923120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58040 (or 58031 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 128539923120 in words is "one hundred twenty-eight billion, five hundred thirty-nine million, nine hundred twenty-three thousand, one hundred twenty".