220028717 has 2 divisors, whose sum is σ = 220028718. Its totient is φ = 220028716.

The previous prime is 220028687. The next prime is 220028729. The reversal of 220028717 is 717820022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157602916 + 62425801 = 12554^2 + 7901^2 .

It is a cyclic number.

It is not a de Polignac number, because 220028717 - 2⁸ = 220028461 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 220028717.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220028617) 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, 110014358 + 110014359.

It is an arithmetic number, because the mean of its divisors is an integer number (110014359).

Almost surely, 2^220028717 is an apocalyptic number.

It is an amenable number.

220028717 is a deficient number, since it is larger than the sum of its proper divisors (1).

220028717 is an equidigital number, since it uses as much as digits as its factorization.

220028717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 220028717 is about 14833.3649924756. The cubic root of 220028717 is about 603.7073390664.

Adding to 220028717 its reverse (717820022), we get a palindrome (937848739).

The spelling of 220028717 in words is "two hundred twenty million, twenty-eight thousand, seven hundred seventeen".