128555479 has 8 divisors (see below), whose sum is σ = 146588400. Its totient is φ = 111686016.

The previous prime is 128555477. The next prime is 128555489. The reversal of 128555479 is 974555821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128555479 - 2¹ = 128555477 is a prime.

It is a super-2 number, since 2×128555479² = 33053022361838882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128555477) 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, 290629 + ... + 291070.

It is an arithmetic number, because the mean of its divisors is an integer number (18323550).

Almost surely, 2^128555479 is an apocalyptic number.

128555479 is a deficient number, since it is larger than the sum of its proper divisors (18032921).

128555479 is a wasteful number, since it uses less digits than its factorization.

128555479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581729.

The product of its digits is 504000, while the sum is 46.

The square root of 128555479 is about 11338.2308584717. The cubic root of 128555479 is about 504.6963884264.

The spelling of 128555479 in words is "one hundred twenty-eight million, five hundred fifty-five thousand, four hundred seventy-nine".