28320416 has 24 divisors (see below), whose sum is σ = 56165760. Its totient is φ = 14056128.

The previous prime is 28320407. The next prime is 28320421. The reversal of 28320416 is 61402382.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1265 + ... + 7631.

It is an arithmetic number, because the mean of its divisors is an integer number (2340240).

Almost surely, 2^28320416 is an apocalyptic number.

It is an amenable number.

28320416 is a deficient number, since it is larger than the sum of its proper divisors (27845344).

28320416 is a wasteful number, since it uses less digits than its factorization.

28320416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6516 (or 6508 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 28320416 is about 5321.6929637100. The cubic root of 28320416 is about 304.8128063912.

Adding to 28320416 its reverse (61402382), we get a palindrome (89722798).

The spelling of 28320416 in words is "twenty-eight million, three hundred twenty thousand, four hundred sixteen".