128611967 has 16 divisors (see below), whose sum is σ = 143016192. Its totient is φ = 114683520.

The previous prime is 128611949. The next prime is 128611981. The reversal of 128611967 is 769116821.

It is a cyclic number.

It is not a de Polignac number, because 128611967 - 2²⁰ = 127563391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128611907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132518 + ... + 133484.

It is an arithmetic number, because the mean of its divisors is an integer number (8938512).

Almost surely, 2^128611967 is an apocalyptic number.

128611967 is a deficient number, since it is larger than the sum of its proper divisors (14404225).

128611967 is a wasteful number, since it uses less digits than its factorization.

128611967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1198.

The product of its digits is 36288, while the sum is 41.

The square root of 128611967 is about 11340.7216260695. The cubic root of 128611967 is about 504.7702997450.

The spelling of 128611967 in words is "one hundred twenty-eight million, six hundred eleven thousand, nine hundred sixty-seven".