128699128 has 8 divisors (see below), whose sum is σ = 241310880. Its totient is φ = 64349560.

The previous prime is 128699111. The next prime is 128699171. The reversal of 128699128 is 821996821.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 8043688 + ... + 8043703.

It is an arithmetic number, because the mean of its divisors is an integer number (30163860).

Almost surely, 2^128699128 is an apocalyptic number.

It is an amenable number.

128699128 is a deficient number, since it is larger than the sum of its proper divisors (112611752).

128699128 is a wasteful number, since it uses less digits than its factorization.

128699128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16087397 (or 16087393 counting only the distinct ones).

The product of its digits is 124416, while the sum is 46.

The square root of 128699128 is about 11344.5638082740. The cubic root of 128699128 is about 504.8843024826.

The spelling of 128699128 in words is "one hundred twenty-eight million, six hundred ninety-nine thousand, one hundred twenty-eight".