28744241 has 4 divisors (see below), whose sum is σ = 29067300. Its totient is φ = 28421184.

The previous prime is 28744231. The next prime is 28744259. The reversal of 28744241 is 14244782.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5017600 + 23726641 = 2240^2 + 4871^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28744241 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28744198 and 28744207.

It is not an unprimeable number, because it can be changed into a prime (28744231) 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, 161396 + ... + 161573.

It is an arithmetic number, because the mean of its divisors is an integer number (7266825).

Almost surely, 2^28744241 is an apocalyptic number.

It is an amenable number.

28744241 is a deficient number, since it is larger than the sum of its proper divisors (323059).

28744241 is an equidigital number, since it uses as much as digits as its factorization.

28744241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323058.

The product of its digits is 14336, while the sum is 32.

The square root of 28744241 is about 5361.3655909665. The cubic root of 28744241 is about 306.3258273433.

The spelling of 28744241 in words is "twenty-eight million, seven hundred forty-four thousand, two hundred forty-one".