28124449 has 4 divisors (see below), whose sum is σ = 28520640. Its totient is φ = 27728260.

The previous prime is 28124441. The next prime is 28124479. The reversal of 28124449 is 94442182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28124449 - 2³ = 28124441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28124441) 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 in 3 ways as a sum of consecutive naturals, for example, 197989 + ... + 198130.

It is an arithmetic number, because the mean of its divisors is an integer number (7130160).

Almost surely, 2^28124449 is an apocalyptic number.

It is an amenable number.

28124449 is a deficient number, since it is larger than the sum of its proper divisors (396191).

28124449 is an equidigital number, since it uses as much as digits as its factorization.

28124449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396190.

The product of its digits is 18432, while the sum is 34.

The square root of 28124449 is about 5303.2489098665. The cubic root of 28124449 is about 304.1081138141.

The spelling of 28124449 in words is "twenty-eight million, one hundred twenty-four thousand, four hundred forty-nine".