128870867689 has 8 divisors (see below), whose sum is σ = 131945554400. Its totient is φ = 125799712416.

The previous prime is 128870867639. The next prime is 128870867737. The reversal of 128870867689 is 986768078821.

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 128870867689 - 2⁷ = 128870867561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128870867639) 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, 808932 + ... + 955045.

It is an arithmetic number, because the mean of its divisors is an integer number (16493194300).

Almost surely, 2^128870867689 is an apocalyptic number.

It is an amenable number.

128870867689 is a deficient number, since it is larger than the sum of its proper divisors (3074686711).

128870867689 is a wasteful number, since it uses less digits than its factorization.

128870867689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1765719.

The product of its (nonzero) digits is 130056192, while the sum is 70.

The spelling of 128870867689 in words is "one hundred twenty-eight billion, eight hundred seventy million, eight hundred sixty-seven thousand, six hundred eighty-nine".