28398613 has 2 divisors, whose sum is σ = 28398614. Its totient is φ = 28398612.

The previous prime is 28398577. The next prime is 28398641. The reversal of 28398613 is 31689382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25381444 + 3017169 = 5038^2 + 1737^2 .

It is a cyclic number.

It is not a de Polignac number, because 28398613 - 2¹³ = 28390421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28398113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14199306 + 14199307.

It is an arithmetic number, because the mean of its divisors is an integer number (14199307).

Almost surely, 2^28398613 is an apocalyptic number.

It is an amenable number.

28398613 is a deficient number, since it is larger than the sum of its proper divisors (1).

28398613 is an equidigital number, since it uses as much as digits as its factorization.

28398613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 40.

The square root of 28398613 is about 5329.0349032447. The cubic root of 28398613 is about 305.0930935033.

The spelling of 28398613 in words is "twenty-eight million, three hundred ninety-eight thousand, six hundred thirteen".