28307716 has 12 divisors (see below), whose sum is σ = 49673932. Its totient is φ = 14115168.

The previous prime is 28307711. The next prime is 28307723. The reversal of 28307716 is 61770382.

It can be written as a sum of positive squares in 2 ways, for example, as 12673600 + 15634116 = 3560^2 + 3954^2 .

It is not an unprimeable number, because it can be changed into a prime (28307711) by changing a digit.

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, 7995 + ... + 10978.

Almost surely, 2^28307716 is an apocalyptic number.

It is an amenable number.

28307716 is a deficient number, since it is larger than the sum of its proper divisors (21366216).

28307716 is a wasteful number, since it uses less digits than its factorization.

28307716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19350 (or 19348 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 28307716 is about 5320.4996006014. The cubic root of 28307716 is about 304.7672361868.

The spelling of 28307716 in words is "twenty-eight million, three hundred seven thousand, seven hundred sixteen".