128843023785 has 24 divisors (see below), whose sum is σ = 239805792576. Its totient is φ = 58899667680.

The previous prime is 128843023769. The next prime is 128843023787. The reversal of 128843023785 is 587320348821.

It is not a de Polignac number, because 128843023785 - 2⁴ = 128843023769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128843023787) 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, 87647581 + ... + 87649050.

It is an arithmetic number, because the mean of its divisors is an integer number (9991908024).

Almost surely, 2^128843023785 is an apocalyptic number.

128843023785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128843023785 is a deficient number, since it is larger than the sum of its proper divisors (110962768791).

128843023785 is a wasteful number, since it uses less digits than its factorization.

128843023785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175296653 (or 175296646 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 51.

The spelling of 128843023785 in words is "one hundred twenty-eight billion, eight hundred forty-three million, twenty-three thousand, seven hundred eighty-five".