128280769 has 4 divisors (see below), whose sum is σ = 128383920. Its totient is φ = 128177620.

The previous prime is 128280749. The next prime is 128280781. The reversal of 128280769 is 967082821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128280769 - 2⁷ = 128280641 is a prime.

It is a super-2 number, since 2×128280769² = 32911911390462722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128280709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49687 + ... + 52204.

It is an arithmetic number, because the mean of its divisors is an integer number (32095980).

Almost surely, 2^128280769 is an apocalyptic number.

It is an amenable number.

128280769 is a deficient number, since it is larger than the sum of its proper divisors (103151).

128280769 is a wasteful number, since it uses less digits than its factorization.

128280769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103150.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 128280769 is about 11326.1100559724. The cubic root of 128280769 is about 504.3366370821.

The spelling of 128280769 in words is "one hundred twenty-eight million, two hundred eighty thousand, seven hundred sixty-nine".