28073813 has 2 divisors, whose sum is σ = 28073814. Its totient is φ = 28073812.

The previous prime is 28073809. The next prime is 28073819. The reversal of 28073813 is 31837082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25633969 + 2439844 = 5063^2 + 1562^2 .

It is a cyclic number.

It is not a de Polignac number, because 28073813 - 2² = 28073809 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28073813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28073819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14036906 + 14036907.

It is an arithmetic number, because the mean of its divisors is an integer number (14036907).

Almost surely, 2^28073813 is an apocalyptic number.

It is an amenable number.

28073813 is a deficient number, since it is larger than the sum of its proper divisors (1).

28073813 is an equidigital number, since it uses as much as digits as its factorization.

28073813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 28073813 is about 5298.4727044687. The cubic root of 28073813 is about 303.9254960831.

The spelling of 28073813 in words is "twenty-eight million, seventy-three thousand, eight hundred thirteen".