28250222 has 64 divisors (see below), whose sum is σ = 57867264. Its totient is φ = 9987840.

The previous prime is 28250213. The next prime is 28250227. The reversal of 28250222 is 22205282.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28250227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 206138 + ... + 206274.

It is an arithmetic number, because the mean of its divisors is an integer number (904176).

Almost surely, 2^28250222 is an apocalyptic number.

28250222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28250222 is an abundant number, since it is smaller than the sum of its proper divisors (29617042).

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

28250222 is a wasteful number, since it uses less digits than its factorization.

28250222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 28250222 is about 5315.0937903296. The cubic root of 28250222 is about 304.5607652293.

The spelling of 28250222 in words is "twenty-eight million, two hundred fifty thousand, two hundred twenty-two".