128439242220 has 48 divisors (see below), whose sum is σ = 359650222848. Its totient is φ = 34248527040.

The previous prime is 128439242209. The next prime is 128439242221. The reversal of 128439242220 is 22242934821.

It is not an unprimeable number, because it can be changed into a prime (128439242221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1239657 + ... + 1339263.

It is an arithmetic number, because the mean of its divisors is an integer number (7492712976).

Almost surely, 2^128439242220 is an apocalyptic number.

128439242220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128439242220 is an abundant number, since it is smaller than the sum of its proper divisors (231210980628).

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

128439242220 is a wasteful number, since it uses less digits than its factorization.

128439242220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121110 (or 121108 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 39.

The spelling of 128439242220 in words is "one hundred twenty-eight billion, four hundred thirty-nine million, two hundred forty-two thousand, two hundred twenty".