306428 has 6 divisors (see below), whose sum is σ = 536256. Its totient is φ = 153212.

The previous prime is 306421. The next prime is 306431. The reversal of 306428 is 824603.

It is a happy number.

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 306428.

It is not an unprimeable number, because it can be changed into a prime (306421) by changing a digit.

306428 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 as a sum of consecutive naturals, namely, 38300 + ... + 38307.

It is an arithmetic number, because the mean of its divisors is an integer number (89376).

2³⁰⁶⁴²⁸ is an apocalyptic number.

It is an amenable number.

306428 is a deficient number, since it is larger than the sum of its proper divisors (229828).

306428 is a wasteful number, since it uses less digits than its factorization.

306428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76611 (or 76609 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 306428 is about 553.5593915742. The cubic root of 306428 is about 67.4180441083.

The spelling of 306428 in words is "three hundred six thousand, four hundred twenty-eight".