217945086 has 24 divisors (see below), whose sum is σ = 460043784. Its totient is φ = 68824080.

The previous prime is 217945051. The next prime is 217945103. The reversal of 217945086 is 680549712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48145 + ... + 52476.

It is an arithmetic number, because the mean of its divisors is an integer number (19168491).

Almost surely, 2^217945086 is an apocalyptic number.

217945086 is an abundant number, since it is smaller than the sum of its proper divisors (242098698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

217945086 is a wasteful number, since it uses less digits than its factorization.

217945086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100664 (or 100645 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 217945086 is about 14762.9633204178. The cubic root of 217945086 is about 601.7956264045.

The spelling of 217945086 in words is "two hundred seventeen million, nine hundred forty-five thousand, eighty-six".