128306 has 4 divisors (see below), whose sum is σ = 192462. Its totient is φ = 64152.

The previous prime is 128291. The next prime is 128311. The reversal of 128306 is 603821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 70225 + 58081 = 265^2 + 241^2 .

It is a nialpdrome in base 11.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32075 + ... + 32078.

2¹²⁸³⁰⁶ is an apocalyptic number.

128306 is a deficient number, since it is larger than the sum of its proper divisors (64156).

128306 is an equidigital number, since it uses as much as digits as its factorization.

128306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64155.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 128306 is about 358.1982691192. The cubic root of 128306 is about 50.4369700192.

It can be divided in two parts, 128 and 306, that added together give a palindrome (434).

The spelling of 128306 in words is "one hundred twenty-eight thousand, three hundred six".