28149559 has 2 divisors, whose sum is σ = 28149560. Its totient is φ = 28149558.

The previous prime is 28149557. The next prime is 28149593. The reversal of 28149559 is 95594182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28149559 - 2¹ = 28149557 is a prime.

Together with 28149557, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28149551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14074779 + 14074780.

It is an arithmetic number, because the mean of its divisors is an integer number (14074780).

Almost surely, 2^28149559 is an apocalyptic number.

28149559 is a deficient number, since it is larger than the sum of its proper divisors (1).

28149559 is an equidigital number, since it uses as much as digits as its factorization.

28149559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 43.

The square root of 28149559 is about 5305.6157983782. The cubic root of 28149559 is about 304.1985912406.

The spelling of 28149559 in words is "twenty-eight million, one hundred forty-nine thousand, five hundred fifty-nine".