128566217960 has 64 divisors (see below), whose sum is σ = 295718169600. Its totient is φ = 50289990400.

The previous prime is 128566217953. The next prime is 128566217977. The reversal of 128566217960 is 69712665821.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 308150 + ... + 593370.

It is an arithmetic number, because the mean of its divisors is an integer number (4620596400).

Almost surely, 2^128566217960 is an apocalyptic number.

128566217960 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 128566217960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147859084800).

128566217960 is an abundant number, since it is smaller than the sum of its proper divisors (167151951640).

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

128566217960 is a wasteful number, since it uses less digits than its factorization.

128566217960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285482 (or 285478 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 53.

The spelling of 128566217960 in words is "one hundred twenty-eight billion, five hundred sixty-six million, two hundred seventeen thousand, nine hundred sixty".