28530839 has 2 divisors, whose sum is σ = 28530840. Its totient is φ = 28530838.

The previous prime is 28530823. The next prime is 28530847. The reversal of 28530839 is 93803582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28530839 - 2⁴ = 28530823 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28530899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14265419 + 14265420.

It is an arithmetic number, because the mean of its divisors is an integer number (14265420).

Almost surely, 2^28530839 is an apocalyptic number.

28530839 is a deficient number, since it is larger than the sum of its proper divisors (1).

28530839 is an equidigital number, since it uses as much as digits as its factorization.

28530839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 28530839 is about 5341.4266820766. The cubic root of 28530839 is about 305.5658723471.

The spelling of 28530839 in words is "twenty-eight million, five hundred thirty thousand, eight hundred thirty-nine".