28318387 has 2 divisors, whose sum is σ = 28318388. Its totient is φ = 28318386.

The previous prime is 28318361. The next prime is 28318391. The reversal of 28318387 is 78381382.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28318387 is a prime.

It is not a weakly prime, because it can be changed into another prime (28318307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14159193 + 14159194.

It is an arithmetic number, because the mean of its divisors is an integer number (14159194).

Almost surely, 2^28318387 is an apocalyptic number.

28318387 is a deficient number, since it is larger than the sum of its proper divisors (1).

28318387 is an equidigital number, since it uses as much as digits as its factorization.

28318387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 40.

The square root of 28318387 is about 5321.5023254716. The cubic root of 28318387 is about 304.8055268377.

The spelling of 28318387 in words is "twenty-eight million, three hundred eighteen thousand, three hundred eighty-seven".