128226556872 has 132 divisors (see below), whose sum is σ = 361328681985. Its totient is φ = 42660146880.

The previous prime is 128226556823. The next prime is 128226556873. The reversal of 128226556872 is 278655622821.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

128226556872 is a `hidden beast` number, since 1 + 2 + 8 + 2 + 2 + 6 + 5 + 568 + 72 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 122104120356 + 6122436516 = 349434^2 + 78246^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=253206.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (128226556873) by changing a digit.

It is a polite number, since it can be written in 32 ways as a sum of consecutive naturals, for example, 246115972 + ... + 246116492.

Almost surely, 2^128226556872 is an apocalyptic number.

128226556872 is a gapful number since it is divisible by the number (12) 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 128226556872

128226556872 is an abundant number, since it is smaller than the sum of its proper divisors (233102125113).

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

128226556872 is an frugal number, since it uses more digits than its factorization.

128226556872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078 (or 526 counting only the distinct ones).

The product of its digits is 6451200, while the sum is 54.

The spelling of 128226556872 in words is "one hundred twenty-eight billion, two hundred twenty-six million, five hundred fifty-six thousand, eight hundred seventy-two".