28648237 has 2 divisors, whose sum is σ = 28648238. Its totient is φ = 28648236.

The previous prime is 28648199. The next prime is 28648253. The reversal of 28648237 is 73284682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28366276 + 281961 = 5326^2 + 531^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28648237 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28648237.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28648267) 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 as a sum of consecutive naturals, namely, 14324118 + 14324119.

It is an arithmetic number, because the mean of its divisors is an integer number (14324119).

Almost surely, 2^28648237 is an apocalyptic number.

It is an amenable number.

28648237 is a deficient number, since it is larger than the sum of its proper divisors (1).

28648237 is an equidigital number, since it uses as much as digits as its factorization.

28648237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 40.

The square root of 28648237 is about 5352.4047866356. The cubic root of 28648237 is about 305.9844104721.

The spelling of 28648237 in words is "twenty-eight million, six hundred forty-eight thousand, two hundred thirty-seven".