28323212 has 24 divisors (see below), whose sum is σ = 53394432. Its totient is φ = 13107600.

The previous prime is 28323209. The next prime is 28323277. The reversal of 28323212 is 21232382.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2114 + ... + 7817.

It is an arithmetic number, because the mean of its divisors is an integer number (2224768).

Almost surely, 2^28323212 is an apocalyptic number.

It is an amenable number.

28323212 is a deficient number, since it is larger than the sum of its proper divisors (25071220).

28323212 is a wasteful number, since it uses less digits than its factorization.

28323212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9989 (or 9987 counting only the distinct ones).

The product of its digits is 1152, while the sum is 23.

The square root of 28323212 is about 5321.9556555838. The cubic root of 28323212 is about 304.8228371827.

Adding to 28323212 its reverse (21232382), we get a palindrome (49555594).

The spelling of 28323212 in words is "twenty-eight million, three hundred twenty-three thousand, two hundred twelve".