28223266 has 4 divisors (see below), whose sum is σ = 42334902. Its totient is φ = 14111632.

The previous prime is 28223263. The next prime is 28223311. The reversal of 28223266 is 66232282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66232282 = 2 ⋅33116141.

It can be written as a sum of positive squares in only one way, i.e., 18792225 + 9431041 = 4335^2 + 3071^2 .

It is not an unprimeable number, because it can be changed into a prime (28223263) 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 as a sum of consecutive naturals, namely, 7055815 + ... + 7055818.

Almost surely, 2^28223266 is an apocalyptic number.

28223266 is a deficient number, since it is larger than the sum of its proper divisors (14111636).

28223266 is a wasteful number, since it uses less digits than its factorization.

28223266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14111635.

The product of its digits is 13824, while the sum is 31.

The square root of 28223266 is about 5312.5573879253. The cubic root of 28223266 is about 304.4638650754.

The spelling of 28223266 in words is "twenty-eight million, two hundred twenty-three thousand, two hundred sixty-six".