28022805 has 12 divisors (see below), whose sum is σ = 48572940. Its totient is φ = 14945472.

The previous prime is 28022789. The next prime is 28022831. The reversal of 28022805 is 50822082.

It can be written as a sum of positive squares in 2 ways, for example, as 11229201 + 16793604 = 3351^2 + 4098^2 .

It is not a de Polignac number, because 28022805 - 2⁴ = 28022789 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 311320 + ... + 311409.

It is an arithmetic number, because the mean of its divisors is an integer number (4047745).

Almost surely, 2^28022805 is an apocalyptic number.

It is an amenable number.

28022805 is a deficient number, since it is larger than the sum of its proper divisors (20550135).

28022805 is a wasteful number, since it uses less digits than its factorization.

28022805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622740 (or 622737 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 28022805 is about 5293.6570534934. The cubic root of 28022805 is about 303.7413145919.

Adding to 28022805 its reverse (50822082), we get a palindrome (78844887).

The spelling of 28022805 in words is "twenty-eight million, twenty-two thousand, eight hundred five".