128305134 has 40 divisors (see below), whose sum is σ = 291814248. Its totient is φ = 42126480.

The previous prime is 128305123. The next prime is 128305181. The reversal of 128305134 is 431503821.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 128305098 and 128305107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4944 + ... + 16764.

Almost surely, 2^128305134 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128305134, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145907124).

128305134 is an abundant number, since it is smaller than the sum of its proper divisors (163509114).

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

128305134 is a wasteful number, since it uses less digits than its factorization.

128305134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11902 (or 11893 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 128305134 is about 11327.1856169130. The cubic root of 128305134 is about 504.3685654435.

Adding to 128305134 its reverse (431503821), we get a palindrome (559808955).

The spelling of 128305134 in words is "one hundred twenty-eight million, three hundred five thousand, one hundred thirty-four".