28303313 has 2 divisors, whose sum is σ = 28303314. Its totient is φ = 28303312.

The previous prime is 28303309. The next prime is 28303337. The reversal of 28303313 is 31330382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20729809 + 7573504 = 4553^2 + 2752^2 .

It is a cyclic number.

It is not a de Polignac number, because 28303313 - 2² = 28303309 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28303343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14151656 + 14151657.

It is an arithmetic number, because the mean of its divisors is an integer number (14151657).

Almost surely, 2^28303313 is an apocalyptic number.

It is an amenable number.

28303313 is a deficient number, since it is larger than the sum of its proper divisors (1).

28303313 is an equidigital number, since it uses as much as digits as its factorization.

28303313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 28303313 is about 5320.0858075787. The cubic root of 28303313 is about 304.7514341381.

Adding to 28303313 its reverse (31330382), we get a palindrome (59633695).

The spelling of 28303313 in words is "twenty-eight million, three hundred three thousand, three hundred thirteen".