128530 has 8 divisors (see below), whose sum is σ = 231372. Its totient is φ = 51408.

The previous prime is 128521. The next prime is 128549. The reversal of 128530 is 35821.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 123201 + 5329 = 351^2 + 73^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 128498 and 128507.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6417 + ... + 6436.

2¹²⁸⁵³⁰ is an apocalyptic number.

128530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128530 is a deficient number, since it is larger than the sum of its proper divisors (102842).

128530 is a wasteful number, since it uses less digits than its factorization.

128530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12860.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 128530 is about 358.5108087631. The cubic root of 128530 is about 50.4663043526.

The spelling of 128530 in words is "one hundred twenty-eight thousand, five hundred thirty".