28063705 has 4 divisors (see below), whose sum is σ = 33676452. Its totient is φ = 22450960.

The previous prime is 28063699. The next prime is 28063709. The reversal of 28063705 is 50736082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50736082 = 2 ⋅25368041.

It can be written as a sum of positive squares in 2 ways, for example, as 7750656 + 20313049 = 2784^2 + 4507^2 .

It is not a de Polignac number, because 28063705 - 2³ = 28063697 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28063709) 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, 2806366 + ... + 2806375.

It is an arithmetic number, because the mean of its divisors is an integer number (8419113).

Almost surely, 2^28063705 is an apocalyptic number.

It is an amenable number.

28063705 is a deficient number, since it is larger than the sum of its proper divisors (5612747).

28063705 is an equidigital number, since it uses as much as digits as its factorization.

28063705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5612746.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 28063705 is about 5297.5187588153. The cubic root of 28063705 is about 303.8890154943.

Adding to 28063705 its reverse (50736082), we get a palindrome (78799787).

The spelling of 28063705 in words is "twenty-eight million, sixty-three thousand, seven hundred five".