28221122 has 16 divisors (see below), whose sum is σ = 45670392. Its totient is φ = 13029120.

The previous prime is 28221119. The next prime is 28221133. The reversal of 28221122 is 22112282.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 26946481 + 1274641 = 5191^2 + 1129^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28221094 and 28221103.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6029 + ... + 9632.

Almost surely, 2^28221122 is an apocalyptic number.

28221122 is a deficient number, since it is larger than the sum of its proper divisors (17449270).

28221122 is a wasteful number, since it uses less digits than its factorization.

28221122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15733.

The product of its digits is 256, while the sum is 20.

The square root of 28221122 is about 5312.3555980375. The cubic root of 28221122 is about 304.4561552772.

The spelling of 28221122 in words is "twenty-eight million, two hundred twenty-one thousand, one hundred twenty-two".