128509765108872 has 96 divisors (see below), whose sum is σ = 380778838272000. Its totient is φ = 36024300713856.

The previous prime is 128509765108831. The next prime is 128509765108883. The reversal of 128509765108872 is 278801567905821.

It is a super-2 number, since 2×128509765108872² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128509765108797 and 128509765108806.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1030852872 + ... + 1030977527.

It is an arithmetic number, because the mean of its divisors is an integer number (3966446232000).

Almost surely, 2^{128509765108872} is an apocalyptic number.

128509765108872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128509765108872 is an abundant number, since it is smaller than the sum of its proper divisors (252269073163128).

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

128509765108872 is a wasteful number, since it uses less digits than its factorization.

128509765108872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2061830475 (or 2061830464 counting only the distinct ones).

The product of its (nonzero) digits is 135475200, while the sum is 69.

The spelling of 128509765108872 in words is "one hundred twenty-eight trillion, five hundred nine billion, seven hundred sixty-five million, one hundred eight thousand, eight hundred seventy-two".