28446289 has 2 divisors, whose sum is σ = 28446290. Its totient is φ = 28446288.

The previous prime is 28446277. The next prime is 28446293. The reversal of 28446289 is 98264482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23571025 + 4875264 = 4855^2 + 2208^2 .

It is a cyclic number.

It is not a de Polignac number, because 28446289 - 2⁷ = 28446161 is a prime.

It is not a weakly prime, because it can be changed into another prime (28446259) 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, 14223144 + 14223145.

It is an arithmetic number, because the mean of its divisors is an integer number (14223145).

Almost surely, 2^28446289 is an apocalyptic number.

It is an amenable number.

28446289 is a deficient number, since it is larger than the sum of its proper divisors (1).

28446289 is an equidigital number, since it uses as much as digits as its factorization.

28446289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 221184, while the sum is 43.

The square root of 28446289 is about 5333.5062576133. The cubic root of 28446289 is about 305.2637296081.

It can be divided in two parts, 2 and 8446289, that multiplied together give a triangular number (16892578 = T₅₈₁₂).

The spelling of 28446289 in words is "twenty-eight million, four hundred forty-six thousand, two hundred eighty-nine".