28470289 has 2 divisors, whose sum is σ = 28470290. Its totient is φ = 28470288.

The previous prime is 28470287. The next prime is 28470293. The reversal of 28470289 is 98207482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25553025 + 2917264 = 5055^2 + 1708^2 .

It is a cyclic number.

It is not a de Polignac number, because 28470289 - 2¹ = 28470287 is a prime.

Together with 28470287, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28470283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14235144 + 14235145.

It is an arithmetic number, because the mean of its divisors is an integer number (14235145).

Almost surely, 2^28470289 is an apocalyptic number.

It is an amenable number.

28470289 is a deficient number, since it is larger than the sum of its proper divisors (1).

28470289 is an equidigital number, since it uses as much as digits as its factorization.

28470289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 28470289 is about 5335.7557103001. The cubic root of 28470289 is about 305.3495553325.

The spelling of 28470289 in words is "twenty-eight million, four hundred seventy thousand, two hundred eighty-nine".