28915559 has 2 divisors, whose sum is σ = 28915560. Its totient is φ = 28915558.

The previous prime is 28915517. The next prime is 28915561. The reversal of 28915559 is 95551982.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28915559 - 2¹⁶ = 28850023 is a prime.

It is a super-2 number, since 2×28915559² = 1672219104564962, which contains 22 as substring.

Together with 28915561, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28915259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14457779 + 14457780.

It is an arithmetic number, because the mean of its divisors is an integer number (14457780).

Almost surely, 2^28915559 is an apocalyptic number.

28915559 is a deficient number, since it is larger than the sum of its proper divisors (1).

28915559 is an equidigital number, since it uses as much as digits as its factorization.

28915559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162000, while the sum is 44.

The square root of 28915559 is about 5377.3189416288. The cubic root of 28915559 is about 306.9331978423.

The spelling of 28915559 in words is "twenty-eight million, nine hundred fifteen thousand, five hundred fifty-nine".