128608722 has 78 divisors (see below), whose sum is σ = 318067239. Its totient is φ = 38972340.

The previous prime is 128608721. The next prime is 128608751. The reversal of 128608722 is 227806821.

It is a happy number.

128608722 is a `hidden beast` number, since 1 + 28 + 608 + 7 + 22 = 666.

It can be written as a sum of positive squares in only one way, i.e., 64304361 + 64304361 = 8019^2 + 8019^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=8019.

It is a nialpdrome in base 3.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (128608721) by changing a digit.

It is a polite number, since it can be written in 38 ways as a sum of consecutive naturals, for example, 11691697 + ... + 11691707.

Almost surely, 2^128608722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128608722

128608722 is an abundant number, since it is smaller than the sum of its proper divisors (189458517).

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

128608722 is an frugal number, since it uses more digits than its factorization.

128608722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60 (or 16 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 128608722 is about 11340.5785566698. The cubic root of 128608722 is about 504.7660544339.

The spelling of 128608722 in words is "one hundred twenty-eight million, six hundred eight thousand, seven hundred twenty-two".