128944765 has 8 divisors (see below), whose sum is σ = 154799928. Its totient is φ = 103111680.

The previous prime is 128944757. The next prime is 128944769. The reversal of 128944765 is 567449821.

It can be written as a sum of positive squares in 4 ways, for example, as 31843449 + 97101316 = 5643^2 + 9854^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128944765 - 2³ = 128944757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128944769) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12969 + ... + 20641.

It is an arithmetic number, because the mean of its divisors is an integer number (19349991).

Almost surely, 2^128944765 is an apocalyptic number.

It is an amenable number.

128944765 is a deficient number, since it is larger than the sum of its proper divisors (25855163).

128944765 is an equidigital number, since it uses as much as digits as its factorization.

128944765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11039.

The product of its digits is 483840, while the sum is 46.

The square root of 128944765 is about 11355.3848459663. The cubic root of 128944765 is about 505.2053081488.

The spelling of 128944765 in words is "one hundred twenty-eight million, nine hundred forty-four thousand, seven hundred sixty-five".