28085445 has 24 divisors (see below), whose sum is σ = 51546456. Its totient is φ = 14097408.

The previous prime is 28085443. The next prime is 28085459. The reversal of 28085445 is 54458082.

It can be written as a sum of positive squares in 4 ways, for example, as 10771524 + 17313921 = 3282^2 + 4161^2 .

It is not a de Polignac number, because 28085445 - 2¹ = 28085443 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28085441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17592 + ... + 19121.

It is an arithmetic number, because the mean of its divisors is an integer number (2147769).

Almost surely, 2^28085445 is an apocalyptic number.

It is an amenable number.

28085445 is a deficient number, since it is larger than the sum of its proper divisors (23461011).

28085445 is a wasteful number, since it uses less digits than its factorization.

28085445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36741 (or 36738 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 36.

The square root of 28085445 is about 5299.5702655970. The cubic root of 28085445 is about 303.9674660763.

The spelling of 28085445 in words is "twenty-eight million, eighty-five thousand, four hundred forty-five".