28181017 has 2 divisors, whose sum is σ = 28181018. Its totient is φ = 28181016.

The previous prime is 28180991. The next prime is 28181051. The reversal of 28181017 is 71018182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26790976 + 1390041 = 5176^2 + 1179^2 .

It is a cyclic number.

It is not a de Polignac number, because 28181017 - 2¹⁵ = 28148249 is a prime.

It is not a weakly prime, because it can be changed into another prime (28181317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14090508 + 14090509.

It is an arithmetic number, because the mean of its divisors is an integer number (14090509).

Almost surely, 2^28181017 is an apocalyptic number.

It is an amenable number.

28181017 is a deficient number, since it is larger than the sum of its proper divisors (1).

28181017 is an equidigital number, since it uses as much as digits as its factorization.

28181017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 28.

The square root of 28181017 is about 5308.5795651944. The cubic root of 28181017 is about 304.3118661563.

Adding to 28181017 its reverse (71018182), we get a palindrome (99199199).

The spelling of 28181017 in words is "twenty-eight million, one hundred eighty-one thousand, seventeen".