128996959 has 24 divisors (see below), whose sum is σ = 167196960. Its totient is φ = 98529984.

The previous prime is 128996929. The next prime is 128996977. The reversal of 128996959 is 959699821.

It is not a de Polignac number, because 128996959 - 2⁵ = 128996927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128996929) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14982 + ... + 21964.

It is an arithmetic number, because the mean of its divisors is an integer number (6966540).

Almost surely, 2^128996959 is an apocalyptic number.

128996959 is a deficient number, since it is larger than the sum of its proper divisors (38200001).

128996959 is a wasteful number, since it uses less digits than its factorization.

128996959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7039 (or 7032 counting only the distinct ones).

The product of its digits is 3149280, while the sum is 58.

The square root of 128996959 is about 11357.6828182513. The cubic root of 128996959 is about 505.2734642796.

The spelling of 128996959 in words is "one hundred twenty-eight million, nine hundred ninety-six thousand, nine hundred fifty-nine".