128439338112 has 72 divisors (see below), whose sum is σ = 369632580915. Its totient is φ = 42809058048.

The previous prime is 128439338107. The next prime is 128439338119. The reversal of 128439338112 is 211833934821.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

128439338112 is a `hidden beast` number, since 1 + 284 + 39 + 338 + 1 + 1 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 64219669056 + 64219669056 = 253416^2 + 253416^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=253416.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (128439338119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12158689 + ... + 12169247.

Almost surely, 2^128439338112 is an apocalyptic number.

128439338112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128439338112 is an abundant number, since it is smaller than the sum of its proper divisors (241193242803).

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

128439338112 is an frugal number, since it uses more digits than its factorization.

128439338112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21138 (or 10564 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The spelling of 128439338112 in words is "one hundred twenty-eight billion, four hundred thirty-nine million, three hundred thirty-eight thousand, one hundred twelve".