128805769 has 16 divisors (see below), whose sum is σ = 142521280. Its totient is φ = 115940160.

The previous prime is 128805767. The next prime is 128805793. The reversal of 128805769 is 967508821.

It is a cyclic number.

It is not a de Polignac number, because 128805769 - 2¹ = 128805767 is a prime.

It is a super-2 number, since 2×128805769² = 33181852255362722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128805767) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28099 + ... + 32359.

It is an arithmetic number, because the mean of its divisors is an integer number (8907580).

Almost surely, 2^128805769 is an apocalyptic number.

128805769 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

128805769 is the 6553-rd hex number.

It is an amenable number.

128805769 is a deficient number, since it is larger than the sum of its proper divisors (13715511).

128805769 is a wasteful number, since it uses less digits than its factorization.

128805769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4360.

The product of its (nonzero) digits is 241920, while the sum is 46.

The square root of 128805769 is about 11349.2629276090. The cubic root of 128805769 is about 505.0237142084.

The spelling of 128805769 in words is "one hundred twenty-eight million, eight hundred five thousand, seven hundred sixty-nine".