28861489 has 2 divisors, whose sum is σ = 28861490. Its totient is φ = 28861488.

The previous prime is 28861487. The next prime is 28861537. The reversal of 28861489 is 98416882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28037025 + 824464 = 5295^2 + 908^2 .

It is a cyclic number.

It is not a de Polignac number, because 28861489 - 2¹ = 28861487 is a prime.

Together with 28861487, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28861487) 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, 14430744 + 14430745.

It is an arithmetic number, because the mean of its divisors is an integer number (14430745).

Almost surely, 2^28861489 is an apocalyptic number.

It is an amenable number.

28861489 is a deficient number, since it is larger than the sum of its proper divisors (1).

28861489 is an equidigital number, since it uses as much as digits as its factorization.

28861489 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 28861489 is about 5372.2889907376. The cubic root of 28861489 is about 306.7417641908.

The spelling of 28861489 in words is "twenty-eight million, eight hundred sixty-one thousand, four hundred eighty-nine".