308128 has 12 divisors (see below), whose sum is σ = 606690. Its totient is φ = 154048.

The previous prime is 308117. The next prime is 308129. The reversal of 308128 is 821803.

308128 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 169744 + 138384 = 412^2 + 372^2 .

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 308099 and 308108.

It is not an unprimeable number, because it can be changed into a prime (308129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4783 + ... + 4846.

2³⁰⁸¹²⁸ is an apocalyptic number.

It is an amenable number.

308128 is a deficient number, since it is larger than the sum of its proper divisors (298562).

308128 is an equidigital number, since it uses as much as digits as its factorization.

308128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9639 (or 9631 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 308128 is about 555.0927850369. The cubic root of 308128 is about 67.5424881106.

It can be divided in two parts, 3081 and 28, that multiplied together give a palindrome (86268).

The spelling of 308128 in words is "three hundred eight thousand, one hundred twenty-eight".