128786660 has 48 divisors (see below), whose sum is σ = 284256000. Its totient is φ = 48918144.

The previous prime is 128786659. The next prime is 128786681. The reversal of 128786660 is 66687821.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67601 + ... + 69479.

It is an arithmetic number, because the mean of its divisors is an integer number (5922000).

Almost surely, 2^128786660 is an apocalyptic number.

128786660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128786660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142128000).

128786660 is an abundant number, since it is smaller than the sum of its proper divisors (155469340).

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

128786660 is a wasteful number, since it uses less digits than its factorization.

128786660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2060 (or 2058 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 128786660 is about 11348.4210355450. The cubic root of 128786660 is about 504.9987386826.

The spelling of 128786660 in words is "one hundred twenty-eight million, seven hundred eighty-six thousand, six hundred sixty".