28814845 has 4 divisors (see below), whose sum is σ = 34577820. Its totient is φ = 23051872.

The previous prime is 28814843. The next prime is 28814857. The reversal of 28814845 is 54841882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54841882 = 2 ⋅27420941.

It can be written as a sum of positive squares in 2 ways, for example, as 18645124 + 10169721 = 4318^2 + 3189^2 .

It is a cyclic number.

It is not a de Polignac number, because 28814845 - 2¹ = 28814843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28814798 and 28814807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28814843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2881480 + ... + 2881489.

It is an arithmetic number, because the mean of its divisors is an integer number (8644455).

Almost surely, 2^28814845 is an apocalyptic number.

It is an amenable number.

28814845 is a deficient number, since it is larger than the sum of its proper divisors (5762975).

28814845 is an equidigital number, since it uses as much as digits as its factorization.

28814845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5762974.

The product of its digits is 81920, while the sum is 40.

The square root of 28814845 is about 5367.9460690286. The cubic root of 28814845 is about 306.5764299459.

The spelling of 28814845 in words is "twenty-eight million, eight hundred fourteen thousand, eight hundred forty-five".