128489863 has 8 divisors (see below), whose sum is σ = 132113232. Its totient is φ = 124874496.

The previous prime is 128489827. The next prime is 128489887. The reversal of 128489863 is 368984821.

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 128489863 - 2²⁵ = 94935431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128489813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47031 + ... + 49687.

It is an arithmetic number, because the mean of its divisors is an integer number (16514154).

Almost surely, 2^128489863 is an apocalyptic number.

128489863 is a deficient number, since it is larger than the sum of its proper divisors (3623369).

128489863 is a wasteful number, since it uses less digits than its factorization.

128489863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4001.

The product of its digits is 663552, while the sum is 49.

The square root of 128489863 is about 11335.3369160339. The cubic root of 128489863 is about 504.6105064545.

The spelling of 128489863 in words is "one hundred twenty-eight million, four hundred eighty-nine thousand, eight hundred sixty-three".