28249226 has 8 divisors (see below), whose sum is σ = 42407364. Its totient is φ = 14113440.

The previous prime is 28249187. The next prime is 28249229. The reversal of 28249226 is 62294282.

It is a Cunningham number, because it is equal to 5315²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 28249225 + 1 = 5315^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (28249229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1955 + ... + 7766.

Almost surely, 2^28249226 is an apocalyptic number.

28249226 is a deficient number, since it is larger than the sum of its proper divisors (14158138).

28249226 is a wasteful number, since it uses less digits than its factorization.

28249226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11176.

The product of its digits is 27648, while the sum is 35.

The square root of 28249226 is about 5315.0000940734. Note that the first 4 decimals coincide. The cubic root of 28249226 is about 304.5571859526.

The spelling of 28249226 in words is "twenty-eight million, two hundred forty-nine thousand, two hundred twenty-six".