28218016 has 12 divisors (see below), whose sum is σ = 55554282. Its totient is φ = 14108992.

The previous prime is 28218007. The next prime is 28218017. The reversal of 28218016 is 61081282.

It can be written as a sum of positive squares in only one way, i.e., 15968016 + 12250000 = 3996^2 + 3500^2 .

It is not an unprimeable number, because it can be changed into a prime (28218017) 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 as a sum of consecutive naturals, namely, 440875 + ... + 440938.

Almost surely, 2^28218016 is an apocalyptic number.

It is an amenable number.

28218016 is a deficient number, since it is larger than the sum of its proper divisors (27336266).

28218016 is an equidigital number, since it uses as much as digits as its factorization.

28218016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881823 (or 881815 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 28218016 is about 5312.0632526355. The cubic root of 28218016 is about 304.4449854459. Note that the first 3 decimals are identical.

Adding to 28218016 its reverse (61081282), we get a palindrome (89299298).

The spelling of 28218016 in words is "twenty-eight million, two hundred eighteen thousand, sixteen".