128197769 has 12 divisors (see below), whose sum is σ = 156978000. Its totient is φ = 104099688.

The previous prime is 128197763. The next prime is 128197801. The reversal of 128197769 is 967791821.

It is not a de Polignac number, because 128197769 - 2⁴ = 128197753 is a prime.

It is a super-2 number, since 2×128197769² = 32869335953154722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128197763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67919 + ... + 69780.

It is an arithmetic number, because the mean of its divisors is an integer number (13081500).

Almost surely, 2^128197769 is an apocalyptic number.

128197769 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

128197769 is a deficient number, since it is larger than the sum of its proper divisors (28780231).

128197769 is a wasteful number, since it uses less digits than its factorization.

128197769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137732 (or 137725 counting only the distinct ones).

The product of its digits is 381024, while the sum is 50.

The square root of 128197769 is about 11322.4453630830. The cubic root of 128197769 is about 504.2278419434.

The spelling of 128197769 in words is "one hundred twenty-eight million, one hundred ninety-seven thousand, seven hundred sixty-nine".