28188122 has 4 divisors (see below), whose sum is σ = 42282186. Its totient is φ = 14094060.

The previous prime is 28188119. The next prime is 28188137. The reversal of 28188122 is 22188182.

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., 21893041 + 6295081 = 4679^2 + 2509^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7047029 + ... + 7047032.

Almost surely, 2^28188122 is an apocalyptic number.

28188122 is a deficient number, since it is larger than the sum of its proper divisors (14094064).

28188122 is a wasteful number, since it uses less digits than its factorization.

28188122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14094063.

The product of its digits is 4096, while the sum is 32.

The square root of 28188122 is about 5309.2487227479. The cubic root of 28188122 is about 304.3374383837.

The spelling of 28188122 in words is "twenty-eight million, one hundred eighty-eight thousand, one hundred twenty-two".