217055368 has 8 divisors (see below), whose sum is σ = 406978830. Its totient is φ = 108527680.

The previous prime is 217055339. The next prime is 217055369. The reversal of 217055368 is 863550712.

It can be written as a sum of positive squares in only one way, i.e., 206152164 + 10903204 = 14358^2 + 3302^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×217055368² = 94226065555230848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (217055369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13565953 + ... + 13565968.

Almost surely, 2^217055368 is an apocalyptic number.

It is an amenable number.

217055368 is a deficient number, since it is larger than the sum of its proper divisors (189923462).

217055368 is a wasteful number, since it uses less digits than its factorization.

217055368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27131927 (or 27131923 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 217055368 is about 14732.7990551694. The cubic root of 217055368 is about 600.9756053897.

The spelling of 217055368 in words is "two hundred seventeen million, fifty-five thousand, three hundred sixty-eight".