217080660 has 48 divisors (see below), whose sum is σ = 628790400. Its totient is φ = 55891584.

The previous prime is 217080623. The next prime is 217080673. The reversal of 217080660 is 66080712.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60640 + ... + 64119.

It is an arithmetic number, because the mean of its divisors is an integer number (13099800).

Almost surely, 2^217080660 is an apocalyptic number.

217080660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217080660 is an abundant number, since it is smaller than the sum of its proper divisors (411709740).

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

217080660 is a wasteful number, since it uses less digits than its factorization.

217080660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124800 (or 124798 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 217080660 is about 14733.6573870849. The cubic root of 217080660 is about 600.9989470295.

The spelling of 217080660 in words is "two hundred seventeen million, eighty thousand, six hundred sixty".