304728509 has 2 divisors, whose sum is σ = 304728510. Its totient is φ = 304728508.

The previous prime is 304728469. The next prime is 304728533. The reversal of 304728509 is 905827403.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 275460409 + 29268100 = 16597^2 + 5410^2 .

It is a cyclic number.

It is not a de Polignac number, because 304728509 - 2¹⁶ = 304662973 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (304728539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152364254 + 152364255.

It is an arithmetic number, because the mean of its divisors is an integer number (152364255).

Almost surely, 2^304728509 is an apocalyptic number.

It is an amenable number.

304728509 is a deficient number, since it is larger than the sum of its proper divisors (1).

304728509 is an equidigital number, since it uses as much as digits as its factorization.

304728509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 304728509 is about 17456.4747013823. The cubic root of 304728509 is about 672.9317645810.

The spelling of 304728509 in words is "three hundred four million, seven hundred twenty-eight thousand, five hundred nine".