28745149 has 2 divisors, whose sum is σ = 28745150. Its totient is φ = 28745148.

The previous prime is 28745117. The next prime is 28745173. The reversal of 28745149 is 94154782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17489124 + 11256025 = 4182^2 + 3355^2 .

It is a cyclic number.

It is not a de Polignac number, because 28745149 - 2⁵ = 28745117 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 (28745179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14372574 + 14372575.

It is an arithmetic number, because the mean of its divisors is an integer number (14372575).

Almost surely, 2^28745149 is an apocalyptic number.

It is an amenable number.

28745149 is a deficient number, since it is larger than the sum of its proper divisors (1).

28745149 is an equidigital number, since it uses as much as digits as its factorization.

28745149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 40.

The square root of 28745149 is about 5361.4502702161. The cubic root of 28745149 is about 306.3290528117.

The spelling of 28745149 in words is "twenty-eight million, seven hundred forty-five thousand, one hundred forty-nine".