28427785 has 4 divisors (see below), whose sum is σ = 34113348. Its totient is φ = 22742224.

The previous prime is 28427783. The next prime is 28427797. The reversal of 28427785 is 58772482.

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 7414729 + 21013056 = 2723^2 + 4584^2 .

It is a cyclic number.

It is not a de Polignac number, because 28427785 - 2¹ = 28427783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28427783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2842774 + ... + 2842783.

It is an arithmetic number, because the mean of its divisors is an integer number (8528337).

Almost surely, 2^28427785 is an apocalyptic number.

It is an amenable number.

28427785 is a deficient number, since it is larger than the sum of its proper divisors (5685563).

28427785 is an equidigital number, since it uses as much as digits as its factorization.

28427785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5685562.

The product of its digits is 250880, while the sum is 43.

The square root of 28427785 is about 5331.7712816662. The cubic root of 28427785 is about 305.1975250113.

The spelling of 28427785 in words is "twenty-eight million, four hundred twenty-seven thousand, seven hundred eighty-five".