28210249 has 2 divisors, whose sum is σ = 28210250. Its totient is φ = 28210248.

The previous prime is 28210187. The next prime is 28210261. The reversal of 28210249 is 94201282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23348224 + 4862025 = 4832^2 + 2205^2 .

It is a cyclic number.

It is not a de Polignac number, because 28210249 - 2²¹ = 26113097 is a prime.

It is not a weakly prime, because it can be changed into another prime (28210349) 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, 14105124 + 14105125.

It is an arithmetic number, because the mean of its divisors is an integer number (14105125).

Almost surely, 2^28210249 is an apocalyptic number.

It is an amenable number.

28210249 is a deficient number, since it is larger than the sum of its proper divisors (1).

28210249 is an equidigital number, since it uses as much as digits as its factorization.

28210249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 28210249 is about 5311.3321304547. The cubic root of 28210249 is about 304.4170500873.

The spelling of 28210249 in words is "twenty-eight million, two hundred ten thousand, two hundred forty-nine".