217208005 has 8 divisors (see below), whose sum is σ = 297885312. Its totient is φ = 148942608.

The previous prime is 217207961. The next prime is 217208023. The reversal of 217208005 is 500802712.

217208005 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 217208005 - 2²³ = 208819397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3102937 + ... + 3103006.

It is an arithmetic number, because the mean of its divisors is an integer number (37235664).

Almost surely, 2^217208005 is an apocalyptic number.

It is an amenable number.

217208005 is a deficient number, since it is larger than the sum of its proper divisors (80677307).

217208005 is an equidigital number, since it uses as much as digits as its factorization.

217208005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6205955.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 217208005 is about 14737.9783213302. The cubic root of 217208005 is about 601.1164444460.

The spelling of 217208005 in words is "two hundred seventeen million, two hundred eight thousand, five".