28868149 has 2 divisors, whose sum is σ = 28868150. Its totient is φ = 28868148.

The previous prime is 28868117. The next prime is 28868153. The reversal of 28868149 is 94186882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27636049 + 1232100 = 5257^2 + 1110^2 .

It is a cyclic number.

It is not a de Polignac number, because 28868149 - 2⁵ = 28868117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28868099 and 28868108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28868249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14434074 + 14434075.

It is an arithmetic number, because the mean of its divisors is an integer number (14434075).

Almost surely, 2^28868149 is an apocalyptic number.

It is an amenable number.

28868149 is a deficient number, since it is larger than the sum of its proper divisors (1).

28868149 is an equidigital number, since it uses as much as digits as its factorization.

28868149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 221184, while the sum is 46.

The square root of 28868149 is about 5372.9088025017. The cubic root of 28868149 is about 306.7653566792.

The spelling of 28868149 in words is "twenty-eight million, eight hundred sixty-eight thousand, one hundred forty-nine".