128769305 has 48 divisors (see below), whose sum is σ = 195022080. Its totient is φ = 81059328.

The previous prime is 128769269. The next prime is 128769307. The reversal of 128769305 is 503967821.

It is not a de Polignac number, because 128769305 - 2²⁶ = 61660441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128769307) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 178736 + ... + 179454.

It is an arithmetic number, because the mean of its divisors is an integer number (4062960).

Almost surely, 2^128769305 is an apocalyptic number.

It is an amenable number.

128769305 is a deficient number, since it is larger than the sum of its proper divisors (66252775).

128769305 is a wasteful number, since it uses less digits than its factorization.

128769305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798 (or 791 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 128769305 is about 11347.6563659639. The cubic root of 128769305 is about 504.9760534997.

The spelling of 128769305 in words is "one hundred twenty-eight million, seven hundred sixty-nine thousand, three hundred five".