28040216 has 16 divisors (see below), whose sum is σ = 54388800. Its totient is φ = 13536544.

The previous prime is 28040209. The next prime is 28040227. The reversal of 28040216 is 61204082.

It is a junction number, because it is equal to n+sod(n) for n = 28040191 and 28040200.

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 3 ways as a sum of consecutive naturals, for example, 60200 + ... + 60663.

It is an arithmetic number, because the mean of its divisors is an integer number (3399300).

Almost surely, 2^28040216 is an apocalyptic number.

It is an amenable number.

28040216 is a deficient number, since it is larger than the sum of its proper divisors (26348584).

28040216 is a wasteful number, since it uses less digits than its factorization.

28040216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120898 (or 120894 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 28040216 is about 5295.3013134287. The cubic root of 28040216 is about 303.8042079525.

Adding to 28040216 its reverse (61204082), we get a palindrome (89244298).

The spelling of 28040216 in words is "twenty-eight million, forty thousand, two hundred sixteen".