28308937 has 2 divisors, whose sum is σ = 28308938. Its totient is φ = 28308936.

The previous prime is 28308923. The next prime is 28308947. The reversal of 28308937 is 73980382.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18455616 + 9853321 = 4296^2 + 3139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28308937 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28308937.

It is not a weakly prime, because it can be changed into another prime (28308947) by changing a digit.

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 as a sum of consecutive naturals, namely, 14154468 + 14154469.

It is an arithmetic number, because the mean of its divisors is an integer number (14154469).

Almost surely, 2^28308937 is an apocalyptic number.

It is an amenable number.

28308937 is a deficient number, since it is larger than the sum of its proper divisors (1).

28308937 is an equidigital number, since it uses as much as digits as its factorization.

28308937 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 28308937 is about 5320.6143442276. The cubic root of 28308937 is about 304.7716179773.

The spelling of 28308937 in words is "twenty-eight million, three hundred eight thousand, nine hundred thirty-seven".