307128 has 32 divisors (see below), whose sum is σ = 783360. Its totient is φ = 100320.

The previous prime is 307121. The next prime is 307129. The reversal of 307128 is 821703.

307128 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 307128.

It is not an unprimeable number, because it can be changed into a prime (307121) by changing a digit.

307128 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1513 + ... + 1703.

It is an arithmetic number, because the mean of its divisors is an integer number (24480).

2³⁰⁷¹²⁸ is an apocalyptic number.

It is an amenable number.

307128 is an abundant number, since it is smaller than the sum of its proper divisors (476232).

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

307128 is a wasteful number, since it uses less digits than its factorization.

307128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267 (or 263 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 307128 is about 554.1913027105. The cubic root of 307128 is about 67.4693413581.

It can be divided in two parts, 307 and 128, that added together give a triangular number (435 = T₂₉).

The spelling of 307128 in words is "three hundred seven thousand, one hundred twenty-eight".