28150817 has 2 divisors, whose sum is σ = 28150818. Its totient is φ = 28150816.

The previous prime is 28150813. The next prime is 28150819. The reversal of 28150817 is 71805182.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19571776 + 8579041 = 4424^2 + 2929^2 .

It is a cyclic number.

It is not a de Polignac number, because 28150817 - 2² = 28150813 is a prime.

Together with 28150819, 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 (28150813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14075408 + 14075409.

It is an arithmetic number, because the mean of its divisors is an integer number (14075409).

Almost surely, 2^28150817 is an apocalyptic number.

It is an amenable number.

28150817 is a deficient number, since it is larger than the sum of its proper divisors (1).

28150817 is an equidigital number, since it uses as much as digits as its factorization.

28150817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 28150817 is about 5305.7343506813. The cubic root of 28150817 is about 304.2031227045.

Adding to 28150817 its reverse (71805182), we get a palindrome (99955999).

The spelling of 28150817 in words is "twenty-eight million, one hundred fifty thousand, eight hundred seventeen".