28398241 has 5 divisors (see below), whose sum is σ = 28792661. Its totient is φ = 28009224.

The previous prime is 28398239. The next prime is 28398247. The reversal of 28398241 is 14289382.

The square root of 28398241 is 5329.

It is a perfect power (a square, a biquadrate), and thus also a powerful number.

It can be written as a sum of positive squares in 2 ways, for example, as 519841 + 27878400 = 721^2 + 5280^2 .

It is not a de Polignac number, because 28398241 - 2¹ = 28398239 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28398241.

It is not an unprimeable number, because it can be changed into a prime (28398247) 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 4 ways as a sum of consecutive naturals, for example, 388981 + ... + 389053.

Almost surely, 2^28398241 is an apocalyptic number.

28398241 is the 5329-th square number.

28398241 is the 2665-th centered octagonal number.

It is an amenable number.

28398241 is a deficient number, since it is larger than the sum of its proper divisors (394420).

28398241 is an frugal number, since it uses more digits than its factorization.

28398241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292 (or 73 counting only the distinct ones).

The product of its digits is 27648, while the sum is 37.

The cubic root of 28398241 is about 305.0917613358.

The spelling of 28398241 in words is "twenty-eight million, three hundred ninety-eight thousand, two hundred forty-one".