28831613 has 2 divisors, whose sum is σ = 28831614. Its totient is φ = 28831612.

The previous prime is 28831573. The next prime is 28831631. The reversal of 28831613 is 31613882.

It is a happy number.

Together with next prime (28831631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19909444 + 8922169 = 4462^2 + 2987^2 .

It is a cyclic number.

It is not a de Polignac number, because 28831613 - 2¹² = 28827517 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28831613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28801613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14415806 + 14415807.

It is an arithmetic number, because the mean of its divisors is an integer number (14415807).

Almost surely, 2^28831613 is an apocalyptic number.

It is an amenable number.

28831613 is a deficient number, since it is larger than the sum of its proper divisors (1).

28831613 is an equidigital number, since it uses as much as digits as its factorization.

28831613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 32.

The square root of 28831613 is about 5369.5077055536. The cubic root of 28831613 is about 306.6358862984.

The spelling of 28831613 in words is "twenty-eight million, eight hundred thirty-one thousand, six hundred thirteen".