28013216 has 48 divisors (see below), whose sum is σ = 68765760. Its totient is φ = 10913280.

The previous prime is 28013179. The next prime is 28013221. The reversal of 28013216 is 61231082.

It is a junction number, because it is equal to n+sod(n) for n = 28013191 and 28013200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3221 + ... + 8148.

It is an arithmetic number, because the mean of its divisors is an integer number (1432620).

Almost surely, 2^28013216 is an apocalyptic number.

It is an amenable number.

28013216 is an abundant number, since it is smaller than the sum of its proper divisors (40752544).

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

28013216 is a wasteful number, since it uses less digits than its factorization.

28013216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11397 (or 11389 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 28013216 is about 5292.7512694250. The cubic root of 28013216 is about 303.7066653393.

Adding to 28013216 its reverse (61231082), we get a palindrome (89244298).

The spelling of 28013216 in words is "twenty-eight million, thirteen thousand, two hundred sixteen".