28085545 has 4 divisors (see below), whose sum is σ = 33702660. Its totient is φ = 22468432.

The previous prime is 28085537. The next prime is 28085549. The reversal of 28085545 is 54558082.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11471769 + 16613776 = 3387^2 + 4076^2 .

It is a cyclic number.

It is not a de Polignac number, because 28085545 - 2³ = 28085537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28085549) 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, 2808550 + ... + 2808559.

It is an arithmetic number, because the mean of its divisors is an integer number (8425665).

Almost surely, 2^28085545 is an apocalyptic number.

It is an amenable number.

28085545 is a deficient number, since it is larger than the sum of its proper divisors (5617115).

28085545 is an equidigital number, since it uses as much as digits as its factorization.

28085545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5617114.

The product of its (nonzero) digits is 64000, while the sum is 37.

The square root of 28085545 is about 5299.5797003159. The cubic root of 28085545 is about 303.9678268410.

It can be divided in two parts, 280855 and 45, that added together give a square (280900 = 530²).

The spelling of 28085545 in words is "twenty-eight million, eighty-five thousand, five hundred forty-five".