28222805 has 16 divisors (see below), whose sum is σ = 38619504. Its totient is φ = 19614720.

The previous prime is 28222783. The next prime is 28222819. The reversal of 28222805 is 50822282.

It can be written as a sum of positive squares in 8 ways, for example, as 586756 + 27636049 = 766^2 + 5257^2 .

It is not a de Polignac number, because 28222805 - 2⁸ = 28222549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11666 + ... + 13875.

It is an arithmetic number, because the mean of its divisors is an integer number (2413719).

Almost surely, 2^28222805 is an apocalyptic number.

It is an amenable number.

28222805 is a deficient number, since it is larger than the sum of its proper divisors (10396699).

28222805 is a wasteful number, since it uses less digits than its factorization.

28222805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25576.

The product of its (nonzero) digits is 5120, while the sum is 29.

The square root of 28222805 is about 5312.5139999816. The cubic root of 28222805 is about 304.4622073579.

The spelling of 28222805 in words is "twenty-eight million, two hundred twenty-two thousand, eight hundred five".