217680830 has 16 divisors (see below), whose sum is σ = 392348880. Its totient is φ = 86956032.

The previous prime is 217680821. The next prime is 217680857. The reversal of 217680830 is 38086712.

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, 6464 + ... + 21843.

It is an arithmetic number, because the mean of its divisors is an integer number (24521805).

Almost surely, 2^217680830 is an apocalyptic number.

217680830 is a deficient number, since it is larger than the sum of its proper divisors (174668050).

217680830 is a wasteful number, since it uses less digits than its factorization.

217680830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29083.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 217680830 is about 14754.0106411782. The cubic root of 217680830 is about 601.5523045284.

The spelling of 217680830 in words is "two hundred seventeen million, six hundred eighty thousand, eight hundred thirty".