305128 has 16 divisors (see below), whose sum is σ = 586080. Its totient is φ = 148848.

The previous prime is 305119. The next prime is 305131. The reversal of 305128 is 821503.

It is a happy number.

It is an unprimeable number.

305128 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100 + ... + 787.

It is an arithmetic number, because the mean of its divisors is an integer number (36630).

2³⁰⁵¹²⁸ is an apocalyptic number.

It is an amenable number.

305128 is a deficient number, since it is larger than the sum of its proper divisors (280952).

305128 is a wasteful number, since it uses less digits than its factorization.

305128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936 (or 932 counting only the distinct ones).

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

The square root of 305128 is about 552.3839244583. The cubic root of 305128 is about 67.3225701407.

The spelling of 305128 in words is "three hundred five thousand, one hundred twenty-eight".