28999549 has 2 divisors, whose sum is σ = 28999550.
Its totient is φ = 28999548.
The previous prime is 28999513. The next prime is 28999577. The reversal of 28999549 is 94599982.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 26193924 + 2805625 = 5118^2 + 1675^2
It is a cyclic number.
It is not a de Polignac number, because 28999549 - 29 = 28999037 is a prime.
It is a self number, because there is not a number n which added to its sum of digits gives 28999549.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (28999349) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14499774 + 14499775.
It is an arithmetic number, because the mean of its divisors is an integer number (14499775).
Almost surely, 228999549 is an apocalyptic number.
It is an amenable number.
28999549 is a deficient number, since it is larger than the sum of its proper divisors (1).
28999549 is an equidigital number, since it uses as much as digits as its factorization.
28999549 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 2099520, while the sum is 55.
The square root of 28999549 is about 5385.1229326729.
The cubic root of 28999549 is about 307.2300898995.
The spelling of 28999549 in words is "twenty-eight million, nine hundred ninety-nine thousand, five hundred forty-nine".