28305716 has 6 divisors (see below), whose sum is σ = 49535010. Its totient is φ = 14152856.

The previous prime is 28305713. The next prime is 28305733. The reversal of 28305716 is 61750382.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 24542116 + 3763600 = 4954^2 + 1940^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28305713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3538211 + ... + 3538218.

It is an arithmetic number, because the mean of its divisors is an integer number (8255835).

Almost surely, 2^28305716 is an apocalyptic number.

It is an amenable number.

28305716 is a deficient number, since it is larger than the sum of its proper divisors (21229294).

28305716 is a wasteful number, since it uses less digits than its factorization.

28305716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7076433 (or 7076431 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 28305716 is about 5320.3116450073. The cubic root of 28305716 is about 304.7600585345.

The spelling of 28305716 in words is "twenty-eight million, three hundred five thousand, seven hundred sixteen".