28515413 has 2 divisors, whose sum is σ = 28515414. Its totient is φ = 28515412.

The previous prime is 28515379. The next prime is 28515427. The reversal of 28515413 is 31451582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14691889 + 13823524 = 3833^2 + 3718^2 .

It is a cyclic number.

It is not a de Polignac number, because 28515413 - 2¹² = 28511317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28515463) 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, 14257706 + 14257707.

It is an arithmetic number, because the mean of its divisors is an integer number (14257707).

Almost surely, 2^28515413 is an apocalyptic number.

It is an amenable number.

28515413 is a deficient number, since it is larger than the sum of its proper divisors (1).

28515413 is an equidigital number, since it uses as much as digits as its factorization.

28515413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800, while the sum is 29.

The square root of 28515413 is about 5339.9824906080. The cubic root of 28515413 is about 305.5107914932.

Adding to 28515413 its reverse (31451582), we get a palindrome (59966995).

The spelling of 28515413 in words is "twenty-eight million, five hundred fifteen thousand, four hundred thirteen".