128534140056 has 128 divisors (see below), whose sum is σ = 405749191680. Its totient is φ = 33061011456.

The previous prime is 128534139973. The next prime is 128534140057. The reversal of 128534140056 is 650041435821.

It is a junction number, because it is equal to n+sod(n) for n = 128534139996 and 128534140023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128534140057) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 912681 + ... + 1044056.

It is an arithmetic number, because the mean of its divisors is an integer number (3169915560).

Almost surely, 2^128534140056 is an apocalyptic number.

It is an amenable number.

128534140056 is an abundant number, since it is smaller than the sum of its proper divisors (277215051624).

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

128534140056 is a wasteful number, since it uses less digits than its factorization.

128534140056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1956793 (or 1956789 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 39.

Adding to 128534140056 its reverse (650041435821), we get a palindrome (778575575877).

The spelling of 128534140056 in words is "one hundred twenty-eight billion, five hundred thirty-four million, one hundred forty thousand, fifty-six".