28874149 has 2 divisors, whose sum is σ = 28874150. Its totient is φ = 28874148.

The previous prime is 28874147. The next prime is 28874161. The reversal of 28874149 is 94147882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28836900 + 37249 = 5370^2 + 193^2 .

It is a cyclic number.

It is not a de Polignac number, because 28874149 - 2¹ = 28874147 is a prime.

Together with 28874147, 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 (28874141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14437074 + 14437075.

It is an arithmetic number, because the mean of its divisors is an integer number (14437075).

Almost surely, 2^28874149 is an apocalyptic number.

It is an amenable number.

28874149 is a deficient number, since it is larger than the sum of its proper divisors (1).

28874149 is an equidigital number, since it uses as much as digits as its factorization.

28874149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 43.

The square root of 28874149 is about 5373.4671302614. The cubic root of 28874149 is about 306.7866080664.

The spelling of 28874149 in words is "twenty-eight million, eight hundred seventy-four thousand, one hundred forty-nine".