28318228 has 6 divisors (see below), whose sum is σ = 49556906. Its totient is φ = 14159112.

The previous prime is 28318217. The next prime is 28318229. The reversal of 28318228 is 82281382.

It can be written as a sum of positive squares in only one way, i.e., 23309584 + 5008644 = 4828^2 + 2238^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28318193 and 28318202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28318229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3539775 + ... + 3539782.

Almost surely, 2^28318228 is an apocalyptic number.

It is an amenable number.

28318228 is a deficient number, since it is larger than the sum of its proper divisors (21238678).

28318228 is a wasteful number, since it uses less digits than its factorization.

28318228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7079561 (or 7079559 counting only the distinct ones).

The product of its digits is 12288, while the sum is 34.

The square root of 28318228 is about 5321.4873860604. The cubic root of 28318228 is about 304.8049563701.

The spelling of 28318228 in words is "twenty-eight million, three hundred eighteen thousand, two hundred twenty-eight".