28036447 has 4 divisors (see below), whose sum is σ = 28084320. Its totient is φ = 27988576.

The previous prime is 28036433. The next prime is 28036483. The reversal of 28036447 is 74463082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74463082 = 2 ⋅37231541.

It is a cyclic number.

It is not a de Polignac number, because 28036447 - 2²³ = 19647839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28036427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23047 + ... + 24232.

It is an arithmetic number, because the mean of its divisors is an integer number (7021080).

Almost surely, 2^28036447 is an apocalyptic number.

28036447 is a deficient number, since it is larger than the sum of its proper divisors (47873).

28036447 is an equidigital number, since it uses as much as digits as its factorization.

28036447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47872.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 28036447 is about 5294.9454199264. The cubic root of 28036447 is about 303.7905954876.

The spelling of 28036447 in words is "twenty-eight million, thirty-six thousand, four hundred forty-seven".