28788413 has 2 divisors, whose sum is σ = 28788414. Its totient is φ = 28788412.

The previous prime is 28788407. The next prime is 28788421. The reversal of 28788413 is 31488782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25836889 + 2951524 = 5083^2 + 1718^2 .

It is a cyclic number.

It is not a de Polignac number, because 28788413 - 2⁶ = 28788349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28788443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14394206 + 14394207.

It is an arithmetic number, because the mean of its divisors is an integer number (14394207).

Almost surely, 2^28788413 is an apocalyptic number.

It is an amenable number.

28788413 is a deficient number, since it is larger than the sum of its proper divisors (1).

28788413 is an equidigital number, since it uses as much as digits as its factorization.

28788413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86016, while the sum is 41.

The square root of 28788413 is about 5365.4834824086. The cubic root of 28788413 is about 306.4826599091.

The spelling of 28788413 in words is "twenty-eight million, seven hundred eighty-eight thousand, four hundred thirteen".