28290307 has 2 divisors, whose sum is σ = 28290308. Its totient is φ = 28290306.

The previous prime is 28290271. The next prime is 28290319. The reversal of 28290307 is 70309282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28290307 - 2⁷ = 28290179 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28290377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14145153 + 14145154.

It is an arithmetic number, because the mean of its divisors is an integer number (14145154).

Almost surely, 2^28290307 is an apocalyptic number.

28290307 is a deficient number, since it is larger than the sum of its proper divisors (1).

28290307 is an equidigital number, since it uses as much as digits as its factorization.

28290307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 28290307 is about 5318.8633184168. The cubic root of 28290307 is about 304.7047469720.

Adding to 28290307 its reverse (70309282), we get a palindrome (98599589).

The spelling of 28290307 in words is "twenty-eight million, two hundred ninety thousand, three hundred seven".