28153441 has 4 divisors (see below), whose sum is σ = 28684692. Its totient is φ = 27622192.

The previous prime is 28153439. The next prime is 28153451. The reversal of 28153441 is 14435182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14435182 = 2 ⋅7217591.

It can be written as a sum of positive squares in 2 ways, for example, as 20976400 + 7177041 = 4580^2 + 2679^2 .

It is a cyclic number.

It is not a de Polignac number, because 28153441 - 2¹ = 28153439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28153451) 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, 265546 + ... + 265651.

It is an arithmetic number, because the mean of its divisors is an integer number (7171173).

Almost surely, 2^28153441 is an apocalyptic number.

It is an amenable number.

28153441 is a deficient number, since it is larger than the sum of its proper divisors (531251).

28153441 is an equidigital number, since it uses as much as digits as its factorization.

28153441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531250.

The product of its digits is 3840, while the sum is 28.

The square root of 28153441 is about 5305.9816245441. The cubic root of 28153441 is about 304.2125742264.

The spelling of 28153441 in words is "twenty-eight million, one hundred fifty-three thousand, four hundred forty-one".