28289463 has 4 divisors (see below), whose sum is σ = 37719288. Its totient is φ = 18859640.

The previous prime is 28289449. The next prime is 28289483. The reversal of 28289463 is 36498282.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28289463 - 2¹⁰ = 28288439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28289483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4714908 + ... + 4714913.

It is an arithmetic number, because the mean of its divisors is an integer number (9429822).

Almost surely, 2^28289463 is an apocalyptic number.

28289463 is a deficient number, since it is larger than the sum of its proper divisors (9429825).

28289463 is an equidigital number, since it uses as much as digits as its factorization.

28289463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9429824.

The product of its digits is 165888, while the sum is 42.

The square root of 28289463 is about 5318.7839775648. The cubic root of 28289463 is about 304.7017168015.

The spelling of 28289463 in words is "twenty-eight million, two hundred eighty-nine thousand, four hundred sixty-three".