28444649 has 4 divisors (see below), whose sum is σ = 28869264. Its totient is φ = 28020036.

The previous prime is 28444597. The next prime is 28444657. The reversal of 28444649 is 94644482.

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 28444649 - 2⁸ = 28444393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28440649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212207 + ... + 212340.

It is an arithmetic number, because the mean of its divisors is an integer number (7217316).

Almost surely, 2^28444649 is an apocalyptic number.

It is an amenable number.

28444649 is a deficient number, since it is larger than the sum of its proper divisors (424615).

28444649 is an equidigital number, since it uses as much as digits as its factorization.

28444649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424614.

The product of its digits is 221184, while the sum is 41.

The square root of 28444649 is about 5333.3525103822. The cubic root of 28444649 is about 305.2578630885.

The spelling of 28444649 in words is "twenty-eight million, four hundred forty-four thousand, six hundred forty-nine".