128976911 has 8 divisors (see below), whose sum is σ = 149421984. Its totient is φ = 109036800.

The previous prime is 128976889. The next prime is 128976919. The reversal of 128976911 is 119679821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128976911 - 2¹⁰ = 128975887 is a prime.

It is a super-2 number, since 2×128976911² = 33270087142203842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128976919) 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 7 ways as a sum of consecutive naturals, for example, 125690 + ... + 126711.

It is an arithmetic number, because the mean of its divisors is an integer number (18677748).

Almost surely, 2^128976911 is an apocalyptic number.

128976911 is a deficient number, since it is larger than the sum of its proper divisors (20445073).

128976911 is an equidigital number, since it uses as much as digits as its factorization.

128976911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252481.

The product of its digits is 54432, while the sum is 44.

The square root of 128976911 is about 11356.8002095661. The cubic root of 128976911 is about 505.2472873131.

The spelling of 128976911 in words is "one hundred twenty-eight million, nine hundred seventy-six thousand, nine hundred eleven".