128181330 has 24 divisors (see below), whose sum is σ = 333271692. Its totient is φ = 34181664.

The previous prime is 128181301. The next prime is 128181331. The reversal of 128181330 is 33181821.

It can be written as a sum of positive squares in 2 ways, for example, as 113870241 + 14311089 = 10671^2 + 3783^2 .

It is a junction number, because it is equal to n+sod(n) for n = 128181294 and 128181303.

It is not an unprimeable number, because it can be changed into a prime (128181331) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 712029 + ... + 712208.

Almost surely, 2^128181330 is an apocalyptic number.

128181330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128181330 is an abundant number, since it is smaller than the sum of its proper divisors (205090362).

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

128181330 is a wasteful number, since it uses less digits than its factorization.

128181330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1424250 (or 1424247 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 128181330 is about 11321.7193923891. The cubic root of 128181330 is about 504.2062883811.

The spelling of 128181330 in words is "one hundred twenty-eight million, one hundred eighty-one thousand, three hundred thirty".