28522273 has 4 divisors (see below), whose sum is σ = 30716308. Its totient is φ = 26328240.

The previous prime is 28522267. The next prime is 28522289. The reversal of 28522273 is 37222582.

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 5702544 + 22819729 = 2388^2 + 4777^2 .

It is a cyclic number.

It is not a de Polignac number, because 28522273 - 2²¹ = 26425121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28522673) 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 3 ways as a sum of consecutive naturals, for example, 1096998 + ... + 1097023.

It is an arithmetic number, because the mean of its divisors is an integer number (7679077).

Almost surely, 2^28522273 is an apocalyptic number.

It is an amenable number.

28522273 is a deficient number, since it is larger than the sum of its proper divisors (2194035).

28522273 is a wasteful number, since it uses less digits than its factorization.

28522273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2194034.

The product of its digits is 13440, while the sum is 31.

The square root of 28522273 is about 5340.6247761849. The cubic root of 28522273 is about 305.5352886074.

The spelling of 28522273 in words is "twenty-eight million, five hundred twenty-two thousand, two hundred seventy-three".