128255998 has 16 divisors (see below), whose sum is σ = 207441360. Its totient is φ = 59121216.

The previous prime is 128255993. The next prime is 128256001. The reversal of 128255998 is 899552821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128255993) 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, 22018 + ... + 27226.

It is an arithmetic number, because the mean of its divisors is an integer number (12965085).

Almost surely, 2^128255998 is an apocalyptic number.

128255998 is a deficient number, since it is larger than the sum of its proper divisors (79185362).

128255998 is a wasteful number, since it uses less digits than its factorization.

128255998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6171.

The product of its digits is 518400, while the sum is 49.

The square root of 128255998 is about 11325.0164679792. The cubic root of 128255998 is about 504.3041725458.

The spelling of 128255998 in words is "one hundred twenty-eight million, two hundred fifty-five thousand, nine hundred ninety-eight".