28891559 has 2 divisors, whose sum is σ = 28891560. Its totient is φ = 28891558.

The previous prime is 28891537. The next prime is 28891573. The reversal of 28891559 is 95519882.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28891559 is a 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 (28891529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14445779 + 14445780.

It is an arithmetic number, because the mean of its divisors is an integer number (14445780).

Almost surely, 2^28891559 is an apocalyptic number.

28891559 is a deficient number, since it is larger than the sum of its proper divisors (1).

28891559 is an equidigital number, since it uses as much as digits as its factorization.

28891559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 259200, while the sum is 47.

The square root of 28891559 is about 5375.0868830187. The cubic root of 28891559 is about 306.8482558481.

The spelling of 28891559 in words is "twenty-eight million, eight hundred ninety-one thousand, five hundred fifty-nine".