28816241 has 4 divisors (see below), whose sum is σ = 30511332. Its totient is φ = 27121152.

The previous prime is 28816223. The next prime is 28816247. The reversal of 28816241 is 14261882.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14261882 = 2 ⋅7130941.

It can be written as a sum of positive squares in 2 ways, for example, as 16982641 + 11833600 = 4121^2 + 3440^2 .

It is a cyclic number.

It is not a de Polignac number, because 28816241 - 2¹⁴ = 28799857 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28816198 and 28816207.

It is not an unprimeable number, because it can be changed into a prime (28816247) 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, 847520 + ... + 847553.

It is an arithmetic number, because the mean of its divisors is an integer number (7627833).

Almost surely, 2^28816241 is an apocalyptic number.

It is an amenable number.

28816241 is a deficient number, since it is larger than the sum of its proper divisors (1695091).

28816241 is a wasteful number, since it uses less digits than its factorization.

28816241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1695090.

The product of its digits is 6144, while the sum is 32.

The square root of 28816241 is about 5368.0760985664. The cubic root of 28816241 is about 306.5813807943.

The spelling of 28816241 in words is "twenty-eight million, eight hundred sixteen thousand, two hundred forty-one".