28122266 has 4 divisors (see below), whose sum is σ = 42183402. Its totient is φ = 14061132.

The previous prime is 28122253. The next prime is 28122271. The reversal of 28122266 is 66222182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 25654225 + 2468041 = 5065^2 + 1571^2 .

It is a Curzon number.

It is an unprimeable number.

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, 7030565 + ... + 7030568.

Almost surely, 2^28122266 is an apocalyptic number.

28122266 is a deficient number, since it is larger than the sum of its proper divisors (14061136).

28122266 is a wasteful number, since it uses less digits than its factorization.

28122266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14061135.

The product of its digits is 4608, while the sum is 29.

The square root of 28122266 is about 5303.0430886426. The cubic root of 28122266 is about 304.1002453911.

The spelling of 28122266 in words is "twenty-eight million, one hundred twenty-two thousand, two hundred sixty-six".