28218912 has 48 divisors (see below), whose sum is σ = 78436512. Its totient is φ = 8852480.

The previous prime is 28218899. The next prime is 28218919. The reversal of 28218912 is 21981282.

It is a tau number, because it is divible by the number of its divisors (48).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28218919) by changing a digit.

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, 7014 + ... + 10277.

It is an arithmetic number, because the mean of its divisors is an integer number (1634094).

Almost surely, 2^28218912 is an apocalyptic number.

It is an amenable number.

28218912 is an abundant number, since it is smaller than the sum of its proper divisors (50217600).

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

28218912 is a wasteful number, since it uses less digits than its factorization.

28218912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17321 (or 17313 counting only the distinct ones).

The product of its digits is 4608, while the sum is 33.

The square root of 28218912 is about 5312.1475883112. The cubic root of 28218912 is about 304.4482077350.

The spelling of 28218912 in words is "twenty-eight million, two hundred eighteen thousand, nine hundred twelve".