28287913 has 2 divisors, whose sum is σ = 28287914. Its totient is φ = 28287912.

The previous prime is 28287877. The next prime is 28287923. The reversal of 28287913 is 31978282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28270489 + 17424 = 5317^2 + 132^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28287913 is a prime.

It is not a weakly prime, because it can be changed into another prime (28287923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14143956 + 14143957.

It is an arithmetic number, because the mean of its divisors is an integer number (14143957).

Almost surely, 2^28287913 is an apocalyptic number.

It is an amenable number.

28287913 is a deficient number, since it is larger than the sum of its proper divisors (1).

28287913 is an equidigital number, since it uses as much as digits as its factorization.

28287913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 40.

The square root of 28287913 is about 5318.6382655714. The cubic root of 28287913 is about 304.6961517578.

The spelling of 28287913 in words is "twenty-eight million, two hundred eighty-seven thousand, nine hundred thirteen".