28019549 has 2 divisors, whose sum is σ = 28019550. Its totient is φ = 28019548.

The previous prime is 28019491. The next prime is 28019573. The reversal of 28019549 is 94591082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25180324 + 2839225 = 5018^2 + 1685^2 .

It is a cyclic number.

It is not a de Polignac number, because 28019549 - 2⁸ = 28019293 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28019149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14009774 + 14009775.

It is an arithmetic number, because the mean of its divisors is an integer number (14009775).

Almost surely, 2^28019549 is an apocalyptic number.

It is an amenable number.

28019549 is a deficient number, since it is larger than the sum of its proper divisors (1).

28019549 is an equidigital number, since it uses as much as digits as its factorization.

28019549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 28019549 is about 5293.3495066923. The cubic root of 28019549 is about 303.7295501257.

The spelling of 28019549 in words is "twenty-eight million, nineteen thousand, five hundred forty-nine".