28684637 has 2 divisors, whose sum is σ = 28684638. Its totient is φ = 28684636.

The previous prime is 28684633. The next prime is 28684651. The reversal of 28684637 is 73648682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28665316 + 19321 = 5354^2 + 139^2 .

It is a cyclic number.

It is not a de Polignac number, because 28684637 - 2² = 28684633 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28684633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14342318 + 14342319.

It is an arithmetic number, because the mean of its divisors is an integer number (14342319).

Almost surely, 2^28684637 is an apocalyptic number.

It is an amenable number.

28684637 is a deficient number, since it is larger than the sum of its proper divisors (1).

28684637 is an equidigital number, since it uses as much as digits as its factorization.

28684637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 44.

The square root of 28684637 is about 5355.8040479465. The cubic root of 28684637 is about 306.1139486200.

The spelling of 28684637 in words is "twenty-eight million, six hundred eighty-four thousand, six hundred thirty-seven".