217628423 has 2 divisors, whose sum is σ = 217628424. Its totient is φ = 217628422.

The previous prime is 217628417. The next prime is 217628429. The reversal of 217628423 is 324826712.

It is a balanced prime because it is at equal distance from previous prime (217628417) and next prime (217628429).

It is a cyclic number.

It is not a de Polignac number, because 217628423 - 2¹⁶ = 217562887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217628429) 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, 108814211 + 108814212.

It is an arithmetic number, because the mean of its divisors is an integer number (108814212).

Almost surely, 2^217628423 is an apocalyptic number.

217628423 is a deficient number, since it is larger than the sum of its proper divisors (1).

217628423 is an equidigital number, since it uses as much as digits as its factorization.

217628423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 35.

The square root of 217628423 is about 14752.2345087109. The cubic root of 217628423 is about 601.5040257680.

The spelling of 217628423 in words is "two hundred seventeen million, six hundred twenty-eight thousand, four hundred twenty-three".