28217112 has 64 divisors (see below), whose sum is σ = 87955200. Its totient is φ = 7328640.

The previous prime is 28217089. The next prime is 28217131. The reversal of 28217112 is 21171282.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 5787 + ... + 9482.

It is an arithmetic number, because the mean of its divisors is an integer number (1374300).

Almost surely, 2^28217112 is an apocalyptic number.

28217112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28217112 is an abundant number, since it is smaller than the sum of its proper divisors (59738088).

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

28217112 is a wasteful number, since it uses less digits than its factorization.

28217112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15296 (or 15292 counting only the distinct ones).

The product of its digits is 448, while the sum is 24.

The square root of 28217112 is about 5311.9781626057. The cubic root of 28217112 is about 304.4417343172.

Adding to 28217112 its reverse (21171282), we get a palindrome (49388394).

The spelling of 28217112 in words is "twenty-eight million, two hundred seventeen thousand, one hundred twelve".