28244186 has 4 divisors (see below), whose sum is σ = 42366282. Its totient is φ = 14122092.

The previous prime is 28244171. The next prime is 28244197. The reversal of 28244186 is 68144282.

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., 24690961 + 3553225 = 4969^2 + 1885^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7061045 + ... + 7061048.

Almost surely, 2^28244186 is an apocalyptic number.

28244186 is a deficient number, since it is larger than the sum of its proper divisors (14122096).

28244186 is a wasteful number, since it uses less digits than its factorization.

28244186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14122095.

The product of its digits is 24576, while the sum is 35.

The square root of 28244186 is about 5314.5259431110. The cubic root of 28244186 is about 304.5390726597.

The spelling of 28244186 in words is "twenty-eight million, two hundred forty-four thousand, one hundred eighty-six".