128866765 has 8 divisors (see below), whose sum is σ = 155322720. Its totient is φ = 102638352.

The previous prime is 128866763. The next prime is 128866789. The reversal of 128866765 is 567668821.

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

It is a cyclic number.

It is not a de Polignac number, because 128866765 - 2¹ = 128866763 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128866763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55635 + ... + 57904.

It is an arithmetic number, because the mean of its divisors is an integer number (19415340).

Almost surely, 2^128866765 is an apocalyptic number.

It is an amenable number.

128866765 is a deficient number, since it is larger than the sum of its proper divisors (26455955).

128866765 is a wasteful number, since it uses less digits than its factorization.

128866765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113771.

The product of its digits is 967680, while the sum is 49.

The square root of 128866765 is about 11351.9498325178. The cubic root of 128866765 is about 505.1034196582.

The spelling of 128866765 in words is "one hundred twenty-eight million, eight hundred sixty-six thousand, seven hundred sixty-five".