28309916 has 24 divisors (see below), whose sum is σ = 51744000. Its totient is φ = 13535424.

The previous prime is 28309909. The next prime is 28309937. The reversal of 28309916 is 61990382.

It is a self number, because there is not a number n which added to its sum of digits gives 28309916.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11525 + ... + 13763.

It is an arithmetic number, because the mean of its divisors is an integer number (2156000).

Almost surely, 2^28309916 is an apocalyptic number.

It is an amenable number.

28309916 is a deficient number, since it is larger than the sum of its proper divisors (23434084).

28309916 is a wasteful number, since it uses less digits than its factorization.

28309916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2381 (or 2379 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 28309916 is about 5320.7063440863. The cubic root of 28309916 is about 304.7751312139.

The spelling of 28309916 in words is "twenty-eight million, three hundred nine thousand, nine hundred sixteen".