28301222 has 12 divisors (see below), whose sum is σ = 44737980. Its totient is φ = 13390308.

The previous prime is 28301213. The next prime is 28301249. The reversal of 28301222 is 22210382.

It is a junction number, because it is equal to n+sod(n) for n = 28301194 and 28301203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32363 + ... + 33225.

It is an arithmetic number, because the mean of its divisors is an integer number (3728165).

Almost surely, 2^28301222 is an apocalyptic number.

28301222 is a deficient number, since it is larger than the sum of its proper divisors (16436758).

28301222 is an frugal number, since it uses more digits than its factorization.

28301222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1747 (or 884 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 28301222 is about 5319.8892845622. The cubic root of 28301222 is about 304.7439291163.

The spelling of 28301222 in words is "twenty-eight million, three hundred one thousand, two hundred twenty-two".