28308222 has 12 divisors (see below), whose sum is σ = 61334520. Its totient is φ = 9436068.

The previous prime is 28308187. The next prime is 28308223. The reversal of 28308222 is 22280382.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28308223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 786322 + ... + 786357.

It is an arithmetic number, because the mean of its divisors is an integer number (5111210).

Almost surely, 2^28308222 is an apocalyptic number.

28308222 is an abundant number, since it is smaller than the sum of its proper divisors (33026298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28308222 is a wasteful number, since it uses less digits than its factorization.

28308222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1572687 (or 1572684 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 28308222 is about 5320.5471523143. The cubic root of 28308222 is about 304.7690520792.

The spelling of 28308222 in words is "twenty-eight million, three hundred eight thousand, two hundred twenty-two".