28213312 has 28 divisors (see below), whose sum is σ = 56180736. Its totient is φ = 14057600.

The previous prime is 28213307. The next prime is 28213313. The reversal of 28213312 is 21331282.

It is not an unprimeable number, because it can be changed into a prime (28213313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23937 + ... + 25087.

Almost surely, 2^28213312 is an apocalyptic number.

It is an amenable number.

28213312 is a deficient number, since it is larger than the sum of its proper divisors (27967424).

28213312 is a wasteful number, since it uses less digits than its factorization.

28213312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1546 (or 1536 counting only the distinct ones).

The product of its digits is 576, while the sum is 22.

The square root of 28213312 is about 5311.6204683693. The cubic root of 28213312 is about 304.4280673087.

Adding to 28213312 its reverse (21331282), we get a palindrome (49544594).

The spelling of 28213312 in words is "twenty-eight million, two hundred thirteen thousand, three hundred twelve".