28120441 has 4 divisors (see below), whose sum is σ = 29027584. Its totient is φ = 27213300.

The previous prime is 28120423. The next prime is 28120447. The reversal of 28120441 is 14402182.

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, and also an emirpimes, since its reverse is a distinct semiprime: 14402182 = 2 ⋅7201091.

It is a cyclic number.

It is not a de Polignac number, because 28120441 - 2¹⁷ = 27989369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28120447) 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, 453525 + ... + 453586.

It is an arithmetic number, because the mean of its divisors is an integer number (7256896).

Almost surely, 2^28120441 is an apocalyptic number.

It is an amenable number.

28120441 is a deficient number, since it is larger than the sum of its proper divisors (907143).

28120441 is an equidigital number, since it uses as much as digits as its factorization.

28120441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907142.

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 28120441 is about 5302.8710148372. The cubic root of 28120441 is about 304.0936670336.

It can be divided in two parts, 28120 and 441, that added together give a 4-th power (28561 = 13⁴).

The spelling of 28120441 in words is "twenty-eight million, one hundred twenty thousand, four hundred forty-one".