28684459 has 4 divisors (see below), whose sum is σ = 28764720. Its totient is φ = 28604200.

The previous prime is 28684417. The next prime is 28684511. The reversal of 28684459 is 95448682.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28684459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28684759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39592 + ... + 40309.

It is an arithmetic number, because the mean of its divisors is an integer number (7191180).

Almost surely, 2^28684459 is an apocalyptic number.

28684459 is a deficient number, since it is larger than the sum of its proper divisors (80261).

28684459 is an equidigital number, since it uses as much as digits as its factorization.

28684459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80260.

The product of its digits is 552960, while the sum is 46.

The square root of 28684459 is about 5355.7874304345. The cubic root of 28684459 is about 306.1133154309.

It can be divided in two parts, 286844 and 59, that added together give a triangular number (286903 = T₇₅₇).

The spelling of 28684459 in words is "twenty-eight million, six hundred eighty-four thousand, four hundred fifty-nine".