28135013 has 2 divisors, whose sum is σ = 28135014. Its totient is φ = 28135012.

The previous prime is 28134989. The next prime is 28135021. The reversal of 28135013 is 31053182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27857284 + 277729 = 5278^2 + 527^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28135013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28135013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28135033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14067506 + 14067507.

It is an arithmetic number, because the mean of its divisors is an integer number (14067507).

Almost surely, 2^28135013 is an apocalyptic number.

It is an amenable number.

28135013 is a deficient number, since it is larger than the sum of its proper divisors (1).

28135013 is an equidigital number, since it uses as much as digits as its factorization.

28135013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 28135013 is about 5304.2448095841. The cubic root of 28135013 is about 304.1461850307.

Adding to 28135013 its reverse (31053182), we get a palindrome (59188195).

The spelling of 28135013 in words is "twenty-eight million, one hundred thirty-five thousand, thirteen".