28026505 has 16 divisors (see below), whose sum is σ = 36331344. Its totient is φ = 20632320.

The previous prime is 28026503. The next prime is 28026517. The reversal of 28026505 is 50562082.

It can be written as a sum of positive squares in 8 ways, for example, as 2866249 + 25160256 = 1693^2 + 5016^2 .

It is not a de Polignac number, because 28026505 - 2¹ = 28026503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28026503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34767 + ... + 35563.

It is an arithmetic number, because the mean of its divisors is an integer number (2270709).

Almost surely, 2^28026505 is an apocalyptic number.

It is an amenable number.

28026505 is a deficient number, since it is larger than the sum of its proper divisors (8304839).

28026505 is a wasteful number, since it uses less digits than its factorization.

28026505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 28026505 is about 5294.0065168075. The cubic root of 28026505 is about 303.7546821974.

Adding to 28026505 its reverse (50562082), we get a palindrome (78588587).

The spelling of 28026505 in words is "twenty-eight million, twenty-six thousand, five hundred five".