128439851372 has 96 divisors (see below), whose sum is σ = 277279801344. Its totient is φ = 50846241600.

The previous prime is 128439851329. The next prime is 128439851381. The reversal of 128439851372 is 273158934821.

It is a super-2 number, since 2×128439851372² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9795773 + ... + 9808875.

It is an arithmetic number, because the mean of its divisors is an integer number (2888331264).

Almost surely, 2^128439851372 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128439851372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138639900672).

128439851372 is an abundant number, since it is smaller than the sum of its proper divisors (148839949972).

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

128439851372 is a wasteful number, since it uses less digits than its factorization.

128439851372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13659 (or 13657 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 53.

The spelling of 128439851372 in words is "one hundred twenty-eight billion, four hundred thirty-nine million, eight hundred fifty-one thousand, three hundred seventy-two".