28684449 has 12 divisors (see below), whose sum is σ = 42968016. Its totient is φ = 19122804.

The previous prime is 28684417. The next prime is 28684511. The reversal of 28684449 is 94448682.

It is not a de Polignac number, because 28684449 - 2⁵ = 28684417 is a prime.

It is a super-2 number, since 2×28684449² = 1645595228867202, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28684349) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58779 + ... + 59264.

It is an arithmetic number, because the mean of its divisors is an integer number (3580668).

Almost surely, 2^28684449 is an apocalyptic number.

It is an amenable number.

28684449 is a deficient number, since it is larger than the sum of its proper divisors (14283567).

28684449 is an equidigital number, since it uses as much as digits as its factorization.

28684449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118058 (or 118046 counting only the distinct ones).

The product of its digits is 442368, while the sum is 45.

The square root of 28684449 is about 5355.7864968649. The cubic root of 28684449 is about 306.1132798584.

The spelling of 28684449 in words is "twenty-eight million, six hundred eighty-four thousand, four hundred forty-nine".