128578653791 has 24 divisors (see below), whose sum is σ = 158419981440. Its totient is φ = 103694180352.

The previous prime is 128578653751. The next prime is 128578653821. The reversal of 128578653791 is 197356875821.

It is a de Polignac number, because none of the positive numbers 2^k-128578653791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128578653701) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2775071 + ... + 2821023.

It is an arithmetic number, because the mean of its divisors is an integer number (6600832560).

Almost surely, 2^128578653791 is an apocalyptic number.

128578653791 is a deficient number, since it is larger than the sum of its proper divisors (29841327649).

128578653791 is a wasteful number, since it uses less digits than its factorization.

128578653791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49343 (or 49336 counting only the distinct ones).

The product of its digits is 25401600, while the sum is 62.

The spelling of 128578653791 in words is "one hundred twenty-eight billion, five hundred seventy-eight million, six hundred fifty-three thousand, seven hundred ninety-one".