128805140856 has 320 divisors, whose sum is σ = 387774921600. Its totient is φ = 35630993664.

The previous prime is 128805140809. The next prime is 128805140869. The reversal of 128805140856 is 658041508821.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 562467750 + ... + 562467978.

It is an arithmetic number, because the mean of its divisors is an integer number (1211796630).

Almost surely, 2^128805140856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128805140856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (193887460800).

128805140856 is an abundant number, since it is smaller than the sum of its proper divisors (258969780744).

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

128805140856 is a wasteful number, since it uses less digits than its factorization.

128805140856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536 (or 511 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 48.

The spelling of 128805140856 in words is "one hundred twenty-eight billion, eight hundred five million, one hundred forty thousand, eight hundred fifty-six".