128687922 has 48 divisors (see below), whose sum is σ = 309935808. Its totient is φ = 38257440.

The previous prime is 128687917. The next prime is 128687941. The reversal of 128687922 is 229786821.

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 23 ways as a sum of consecutive naturals, for example, 4363 + ... + 16625.

It is an arithmetic number, because the mean of its divisors is an integer number (6456996).

Almost surely, 2^128687922 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128687922, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154967904).

128687922 is an abundant number, since it is smaller than the sum of its proper divisors (181247886).

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

128687922 is a wasteful number, since it uses less digits than its factorization.

128687922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12335 (or 12332 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 128687922 is about 11344.0699045801. The cubic root of 128687922 is about 504.8696484136.

The spelling of 128687922 in words is "one hundred twenty-eight million, six hundred eighty-seven thousand, nine hundred twenty-two".