28022773 has 4 divisors (see below), whose sum is σ = 28201420. Its totient is φ = 27844128.

The previous prime is 28022759. The next prime is 28022789. The reversal of 28022773 is 37722082.

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 4422609 + 23600164 = 2103^2 + 4858^2 .

It is a cyclic number.

It is not a de Polignac number, because 28022773 - 2⁵ = 28022741 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 (28022173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89088 + ... + 89401.

It is an arithmetic number, because the mean of its divisors is an integer number (7050355).

Almost surely, 2^28022773 is an apocalyptic number.

It is an amenable number.

28022773 is a deficient number, since it is larger than the sum of its proper divisors (178647).

28022773 is a wasteful number, since it uses less digits than its factorization.

28022773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178646.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 28022773 is about 5293.6540310073. The cubic root of 28022773 is about 303.7411989750.

The spelling of 28022773 in words is "twenty-eight million, twenty-two thousand, seven hundred seventy-three".