28064005 has 4 divisors (see below), whose sum is σ = 33676812. Its totient is φ = 22451200.

The previous prime is 28063951. The next prime is 28064009. The reversal of 28064005 is 50046082.

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 3323329 + 24740676 = 1823^2 + 4974^2 .

It is not a de Polignac number, because 28064005 - 2⁹ = 28063493 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 (28064009) 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, 2806396 + ... + 2806405.

It is an arithmetic number, because the mean of its divisors is an integer number (8419203).

Almost surely, 2^28064005 is an apocalyptic number.

It is an amenable number.

28064005 is a deficient number, since it is larger than the sum of its proper divisors (5612807).

28064005 is an equidigital number, since it uses as much as digits as its factorization.

28064005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5612806.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 28064005 is about 5297.5470738824. The cubic root of 28064005 is about 303.8900983446.

The spelling of 28064005 in words is "twenty-eight million, sixty-four thousand, five".