128617889401 has 8 divisors (see below), whose sum is σ = 135166004864. Its totient is φ = 122231455920.

The previous prime is 128617889369. The next prime is 128617889437. The reversal of 128617889401 is 104988716821.

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 128617889401 - 2⁵ = 128617889369 is a prime.

It is a super-2 number, since 2×128617889401² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128617889441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40418865 + ... + 40422046.

It is an arithmetic number, because the mean of its divisors is an integer number (16895750608).

Almost surely, 2^128617889401 is an apocalyptic number.

It is an amenable number.

128617889401 is a deficient number, since it is larger than the sum of its proper divisors (6548115463).

128617889401 is an equidigital number, since it uses as much as digits as its factorization.

128617889401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80840991.

The product of its (nonzero) digits is 1548288, while the sum is 55.

The spelling of 128617889401 in words is "one hundred twenty-eight billion, six hundred seventeen million, eight hundred eighty-nine thousand, four hundred one".