217080863 has 8 divisors (see below), whose sum is σ = 224827680. Its totient is φ = 209351520.

The previous prime is 217080847. The next prime is 217080869. The reversal of 217080863 is 368080712.

217080863 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 217080863 - 2⁴ = 217080847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217080869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24173 + ... + 31913.

It is an arithmetic number, because the mean of its divisors is an integer number (28103460).

Almost surely, 2^217080863 is an apocalyptic number.

217080863 is a deficient number, since it is larger than the sum of its proper divisors (7746817).

217080863 is an equidigital number, since it uses as much as digits as its factorization.

217080863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8737.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 217080863 is about 14733.6642760720. The cubic root of 217080863 is about 600.9991343681. Note that the first 3 decimals are identical.

The spelling of 217080863 in words is "two hundred seventeen million, eighty thousand, eight hundred sixty-three".