128782709424 has 120 divisors (see below), whose sum is σ = 361650588000. Its totient is φ = 42780441600.

The previous prime is 128782709339. The next prime is 128782709443. The reversal of 128782709424 is 424907287821.

128782709424 is a `hidden beast` number, since 1 + 287 + 8 + 270 + 94 + 2 + 4 = 666.

It is a super-3 number, since 3×128782709424³ (a number of 34 digits) contains 333 as substring.

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, 71505324 + ... + 71507124.

It is an arithmetic number, because the mean of its divisors is an integer number (3013754900).

Almost surely, 2^128782709424 is an apocalyptic number.

It is an amenable number.

128782709424 is an abundant number, since it is smaller than the sum of its proper divisors (232867878576).

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

128782709424 is a wasteful number, since it uses less digits than its factorization.

128782709424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3243 (or 3234 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 54.

The spelling of 128782709424 in words is "one hundred twenty-eight billion, seven hundred eighty-two million, seven hundred nine thousand, four hundred twenty-four".