28071013 has 2 divisors, whose sum is σ = 28071014. Its totient is φ = 28071012.

The previous prime is 28071011. The next prime is 28071059. The reversal of 28071013 is 31017082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28068804 + 2209 = 5298^2 + 47^2 .

It is a cyclic number.

It is not a de Polignac number, because 28071013 - 2¹ = 28071011 is a prime.

Together with 28071011, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28071011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14035506 + 14035507.

It is an arithmetic number, because the mean of its divisors is an integer number (14035507).

Almost surely, 2^28071013 is an apocalyptic number.

It is an amenable number.

28071013 is a deficient number, since it is larger than the sum of its proper divisors (1).

28071013 is an equidigital number, since it uses as much as digits as its factorization.

28071013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 28071013 is about 5298.2084707946. The cubic root of 28071013 is about 303.9153915338.

Adding to 28071013 its reverse (31017082), we get a palindrome (59088095).

The spelling of 28071013 in words is "twenty-eight million, seventy-one thousand, thirteen".