28163801 has 2 divisors, whose sum is σ = 28163802. Its totient is φ = 28163800.

The previous prime is 28163789. The next prime is 28163803. The reversal of 28163801 is 10836182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15808576 + 12355225 = 3976^2 + 3515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28163801 is a prime.

Together with 28163803, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28163803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14081900 + 14081901.

It is an arithmetic number, because the mean of its divisors is an integer number (14081901).

Almost surely, 2^28163801 is an apocalyptic number.

It is an amenable number.

28163801 is a deficient number, since it is larger than the sum of its proper divisors (1).

28163801 is an equidigital number, since it uses as much as digits as its factorization.

28163801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 28163801 is about 5306.9577914282. The cubic root of 28163801 is about 304.2498847132.

Adding to 28163801 its reverse (10836182), we get a palindrome (38999983).

The spelling of 28163801 in words is "twenty-eight million, one hundred sixty-three thousand, eight hundred one".