28012613 has 2 divisors, whose sum is σ = 28012614. Its totient is φ = 28012612.

The previous prime is 28012577. The next prime is 28012619. The reversal of 28012613 is 31621082.

28012613 = 3742² + 3743².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14010049 + 14002564 = 3743^2 + 3742^2 .

It is a cyclic number.

It is not a de Polignac number, because 28012613 - 2⁸ = 28012357 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28012619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14006306 + 14006307.

It is an arithmetic number, because the mean of its divisors is an integer number (14006307).

Almost surely, 2^28012613 is an apocalyptic number.

28012613 is the 3743-rd centered square number.

It is an amenable number.

28012613 is a deficient number, since it is larger than the sum of its proper divisors (1).

28012613 is an equidigital number, since it uses as much as digits as its factorization.

28012613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 28012613 is about 5292.6943044162. The cubic root of 28012613 is about 303.7044861723.

Adding to 28012613 its reverse (31621082), we get a palindrome (59633695).

The spelling of 28012613 in words is "twenty-eight million, twelve thousand, six hundred thirteen".