28113313 has 2 divisors, whose sum is σ = 28113314. Its totient is φ = 28113312.

The previous prime is 28113307. The next prime is 28113329. The reversal of 28113313 is 31331182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25331089 + 2782224 = 5033^2 + 1668^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28113313 is a prime.

It is not a weakly prime, because it can be changed into another prime (28113343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14056656 + 14056657.

It is an arithmetic number, because the mean of its divisors is an integer number (14056657).

Almost surely, 2^28113313 is an apocalyptic number.

It is an amenable number.

28113313 is a deficient number, since it is larger than the sum of its proper divisors (1).

28113313 is an equidigital number, since it uses as much as digits as its factorization.

28113313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 22.

The square root of 28113313 is about 5302.1988834822. The cubic root of 28113313 is about 304.0679708644.

Adding to 28113313 its reverse (31331182), we get a palindrome (59444495).

The spelling of 28113313 in words is "twenty-eight million, one hundred thirteen thousand, three hundred thirteen".