217007660 has 12 divisors (see below), whose sum is σ = 455716128. Its totient is φ = 86803056.

The previous prime is 217007647. The next prime is 217007671. The reversal of 217007660 is 66700712.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5425172 + ... + 5425211.

It is an arithmetic number, because the mean of its divisors is an integer number (37976344).

Almost surely, 2^217007660 is an apocalyptic number.

217007660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217007660 is an abundant number, since it is smaller than the sum of its proper divisors (238708468).

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

217007660 is a wasteful number, since it uses less digits than its factorization.

217007660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10850392 (or 10850390 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 217007660 is about 14731.1798577032. The cubic root of 217007660 is about 600.9315713945.

The spelling of 217007660 in words is "two hundred seventeen million, seven thousand, six hundred sixty".