28618559 has 2 divisors, whose sum is σ = 28618560. Its totient is φ = 28618558.

The previous prime is 28618543. The next prime is 28618631. The reversal of 28618559 is 95581682.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28618559 - 2⁴ = 28618543 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28618459) 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, 14309279 + 14309280.

It is an arithmetic number, because the mean of its divisors is an integer number (14309280).

Almost surely, 2^28618559 is an apocalyptic number.

28618559 is a deficient number, since it is larger than the sum of its proper divisors (1).

28618559 is an equidigital number, since it uses as much as digits as its factorization.

28618559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 44.

The square root of 28618559 is about 5349.6316695638. The cubic root of 28618559 is about 305.8787129505.

The spelling of 28618559 in words is "twenty-eight million, six hundred eighteen thousand, five hundred fifty-nine".