28531579 has 2 divisors, whose sum is σ = 28531580. Its totient is φ = 28531578.

The previous prime is 28531571. The next prime is 28531583. The reversal of 28531579 is 97513582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28531579 - 2³ = 28531571 is a prime.

It is not a weakly prime, because it can be changed into another prime (28531571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14265789 + 14265790.

It is an arithmetic number, because the mean of its divisors is an integer number (14265790).

Almost surely, 2^28531579 is an apocalyptic number.

28531579 is a deficient number, since it is larger than the sum of its proper divisors (1).

28531579 is an equidigital number, since it uses as much as digits as its factorization.

28531579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 40.

The square root of 28531579 is about 5341.4959515102. The cubic root of 28531579 is about 305.5685141293.

The spelling of 28531579 in words is "twenty-eight million, five hundred thirty-one thousand, five hundred seventy-nine".