128844747 has 12 divisors (see below), whose sum is σ = 187757544. Its totient is φ = 85135680.

The previous prime is 128844743. The next prime is 128844763. The reversal of 128844747 is 747448821.

It is not a de Polignac number, because 128844747 - 2² = 128844743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128844743) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62329 + ... + 64362.

It is an arithmetic number, because the mean of its divisors is an integer number (15646462).

Almost surely, 2^128844747 is an apocalyptic number.

128844747 is a deficient number, since it is larger than the sum of its proper divisors (58912797).

128844747 is a wasteful number, since it uses less digits than its factorization.

128844747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126810 (or 126807 counting only the distinct ones).

The product of its digits is 401408, while the sum is 45.

The square root of 128844747 is about 11350.9800017443. The cubic root of 128844747 is about 505.0746509255.

The spelling of 128844747 in words is "one hundred twenty-eight million, eight hundred forty-four thousand, seven hundred forty-seven".