28240613 has 2 divisors, whose sum is σ = 28240614. Its totient is φ = 28240612.

The previous prime is 28240603. The next prime is 28240627. The reversal of 28240613 is 31604282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15864289 + 12376324 = 3983^2 + 3518^2 .

It is a cyclic number.

It is not a de Polignac number, because 28240613 - 2⁶ = 28240549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28240603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14120306 + 14120307.

It is an arithmetic number, because the mean of its divisors is an integer number (14120307).

Almost surely, 2^28240613 is an apocalyptic number.

It is an amenable number.

28240613 is a deficient number, since it is larger than the sum of its proper divisors (1).

28240613 is an equidigital number, since it uses as much as digits as its factorization.

28240613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 28240613 is about 5314.1897783199. The cubic root of 28240613 is about 304.5262303235.

Adding to 28240613 its reverse (31604282), we get a palindrome (59844895).

The spelling of 28240613 in words is "twenty-eight million, two hundred forty thousand, six hundred thirteen".