128905558 has 16 divisors (see below), whose sum is σ = 203432544. Its totient is φ = 61179840.

The previous prime is 128905507. The next prime is 128905559. The reversal of 128905558 is 855509821.

It is a super-3 number, since 3×128905558³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128905559) 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, 18210 + ... + 24277.

It is an arithmetic number, because the mean of its divisors is an integer number (12714534).

Almost surely, 2^128905558 is an apocalyptic number.

128905558 is a deficient number, since it is larger than the sum of its proper divisors (74526986).

128905558 is a wasteful number, since it uses less digits than its factorization.

128905558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42567.

The product of its (nonzero) digits is 144000, while the sum is 43.

The square root of 128905558 is about 11353.6583531477. The cubic root of 128905558 is about 505.1540986447.

The spelling of 128905558 in words is "one hundred twenty-eight million, nine hundred five thousand, five hundred fifty-eight".