128918215824 has 40 divisors (see below), whose sum is σ = 333061843392. Its totient is φ = 42969755520.

The previous prime is 128918215817. The next prime is 128918215891. The reversal of 128918215824 is 428512819821.

It is a happy number.

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, 669829 + ... + 840539.

Almost surely, 2^128918215824 is an apocalyptic number.

It is an amenable number.

128918215824 is an abundant number, since it is smaller than the sum of its proper divisors (204143627568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128918215824 is a wasteful number, since it uses less digits than its factorization.

128918215824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186455 (or 186449 counting only the distinct ones).

The product of its digits is 737280, while the sum is 51.

The spelling of 128918215824 in words is "one hundred twenty-eight billion, nine hundred eighteen million, two hundred fifteen thousand, eight hundred twenty-four".