128960811 has 24 divisors (see below), whose sum is σ = 213224960. Its totient is φ = 73575216.

The previous prime is 128960807. The next prime is 128960831. The reversal of 128960811 is 118069821.

It is not a de Polignac number, because 128960811 - 2² = 128960807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128960831) 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 23 ways as a sum of consecutive naturals, for example, 52926 + ... + 55308.

Almost surely, 2^128960811 is an apocalyptic number.

128960811 is a deficient number, since it is larger than the sum of its proper divisors (84264149).

128960811 is a wasteful number, since it uses less digits than its factorization.

128960811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3255 (or 3252 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

The square root of 128960811 is about 11356.0913610273. The cubic root of 128960811 is about 505.2262633439.

The spelling of 128960811 in words is "one hundred twenty-eight million, nine hundred sixty thousand, eight hundred eleven".