128107478856 has 128 divisors (see below), whose sum is σ = 373699872000. Its totient is φ = 36581690880.

The previous prime is 128107478843. The next prime is 128107478899. The reversal of 128107478856 is 658874701821.

It is a super-2 number, since 2×128107478856² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 128107478796 and 128107478805.

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 31 ways as a sum of consecutive naturals, for example, 20749786 + ... + 20755958.

It is an arithmetic number, because the mean of its divisors is an integer number (2919530250).

Almost surely, 2^128107478856 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 128107478856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186849936000).

128107478856 is an abundant number, since it is smaller than the sum of its proper divisors (245592393144).

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

128107478856 is a wasteful number, since it uses less digits than its factorization.

128107478856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8724 (or 8706 counting only the distinct ones).

The product of its (nonzero) digits is 6021120, while the sum is 57.

The spelling of 128107478856 in words is "one hundred twenty-eight billion, one hundred seven million, four hundred seventy-eight thousand, eight hundred fifty-six".