28699613 has 2 divisors, whose sum is σ = 28699614. Its totient is φ = 28699612.

The previous prime is 28699603. The next prime is 28699639. The reversal of 28699613 is 31699682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18344089 + 10355524 = 4283^2 + 3218^2 .

It is a cyclic number.

It is not a de Polignac number, because 28699613 - 2¹⁰ = 28698589 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28699603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14349806 + 14349807.

It is an arithmetic number, because the mean of its divisors is an integer number (14349807).

Almost surely, 2^28699613 is an apocalyptic number.

It is an amenable number.

28699613 is a deficient number, since it is larger than the sum of its proper divisors (1).

28699613 is an equidigital number, since it uses as much as digits as its factorization.

28699613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 44.

The square root of 28699613 is about 5357.2019749119. The cubic root of 28699613 is about 306.1672124967.

It can be divided in two parts, 286 and 99613, that added together give a palindrome (99899).

The spelling of 28699613 in words is "twenty-eight million, six hundred ninety-nine thousand, six hundred thirteen".