128998906 has 16 divisors (see below), whose sum is σ = 197130240. Its totient is φ = 63297360.

The previous prime is 128998901. The next prime is 128998913. The reversal of 128998906 is 609899821.

It is not an unprimeable number, because it can be changed into a prime (128998901) 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 7 ways as a sum of consecutive naturals, for example, 30535 + ... + 34501.

It is an arithmetic number, because the mean of its divisors is an integer number (12320640).

Almost surely, 2^128998906 is an apocalyptic number.

128998906 is a deficient number, since it is larger than the sum of its proper divisors (68131334).

128998906 is a wasteful number, since it uses less digits than its factorization.

128998906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4269.

The product of its (nonzero) digits is 559872, while the sum is 52.

The square root of 128998906 is about 11357.7685308339. The cubic root of 128998906 is about 505.2760063615.

The spelling of 128998906 in words is "one hundred twenty-eight million, nine hundred ninety-eight thousand, nine hundred six".