306728 has 16 divisors (see below), whose sum is σ = 600480. Its totient is φ = 146608.

The previous prime is 306727. The next prime is 306739. The reversal of 306728 is 827603.

It is a junction number, because it is equal to n+sod(n) for n = 306697 and 306706.

It is not an unprimeable number, because it can be changed into a prime (306727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 650 + ... + 1017.

It is an arithmetic number, because the mean of its divisors is an integer number (37530).

2³⁰⁶⁷²⁸ is an apocalyptic number.

It is an amenable number.

306728 is a deficient number, since it is larger than the sum of its proper divisors (293752).

306728 is a wasteful number, since it uses less digits than its factorization.

306728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1696 (or 1692 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 306728 is about 553.8302989184. The cubic root of 306728 is about 67.4400381998.

The spelling of 306728 in words is "three hundred six thousand, seven hundred twenty-eight".