128855487 has 8 divisors (see below), whose sum is σ = 173061936. Its totient is φ = 85276352.

The previous prime is 128855459. The next prime is 128855491. The reversal of 128855487 is 784558821.

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

It is a cyclic number.

It is not a de Polignac number, because 128855487 - 2¹⁰ = 128854463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128855887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156348 + ... + 157169.

It is an arithmetic number, because the mean of its divisors is an integer number (21632742).

Almost surely, 2^128855487 is an apocalyptic number.

128855487 is a deficient number, since it is larger than the sum of its proper divisors (44206449).

128855487 is a wasteful number, since it uses less digits than its factorization.

128855487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313657.

The product of its digits is 716800, while the sum is 48.

The square root of 128855487 is about 11351.4530787913. The cubic root of 128855487 is about 505.0886842257.

The spelling of 128855487 in words is "one hundred twenty-eight million, eight hundred fifty-five thousand, four hundred eighty-seven".