128896865 has 8 divisors (see below), whose sum is σ = 154795200. Its totient is φ = 103038192.

The previous prime is 128896847. The next prime is 128896897. The reversal of 128896865 is 568698821.

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 128896865 - 2²⁰ = 127848289 is a prime.

It is a super-2 number, since 2×128896865² = 33228803613656450, which contains 22 as substring.

It is an unprimeable number.

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, 2219 + ... + 16208.

It is an arithmetic number, because the mean of its divisors is an integer number (19349400).

Almost surely, 2^128896865 is an apocalyptic number.

It is an amenable number.

128896865 is a deficient number, since it is larger than the sum of its proper divisors (25898335).

128896865 is a wasteful number, since it uses less digits than its factorization.

128896865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19831.

The product of its digits is 1658880, while the sum is 53.

The square root of 128896865 is about 11353.2755185453. The cubic root of 128896865 is about 505.1427430358.

The spelling of 128896865 in words is "one hundred twenty-eight million, eight hundred ninety-six thousand, eight hundred sixty-five".