128505611284 has 24 divisors (see below), whose sum is σ = 230157119808. Its totient is φ = 62746985280.

The previous prime is 128505611279. The next prime is 128505611309. The reversal of 128505611284 is 482116505821.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a self number, because there is not a number n which added to its sum of digits gives 128505611284.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 906969 + ... + 1039039.

It is an arithmetic number, because the mean of its divisors is an integer number (9589879992).

Almost surely, 2^128505611284 is an apocalyptic number.

It is an amenable number.

128505611284 is a deficient number, since it is larger than the sum of its proper divisors (101651508524).

128505611284 is a wasteful number, since it uses less digits than its factorization.

128505611284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137775 (or 137773 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 43.

The spelling of 128505611284 in words is "one hundred twenty-eight billion, five hundred five million, six hundred eleven thousand, two hundred eighty-four".