128649808056 has 256 divisors, whose sum is σ = 425118274560. Its totient is φ = 31409602560.

The previous prime is 128649808031. The next prime is 128649808061. The reversal of 128649808056 is 650808946821.

It is a happy number.

It is a super-2 number, since 2×128649808056² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128649807987 and 128649808005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 29937300 + ... + 29941596.

It is an arithmetic number, because the mean of its divisors is an integer number (1660618260).

Almost surely, 2^128649808056 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 128649808056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212559137280).

128649808056 is an abundant number, since it is smaller than the sum of its proper divisors (296468466504).

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

128649808056 is a wasteful number, since it uses less digits than its factorization.

128649808056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5294 (or 5290 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 57.

The spelling of 128649808056 in words is "one hundred twenty-eight billion, six hundred forty-nine million, eight hundred eight thousand, fifty-six".