217070690 has 8 divisors (see below), whose sum is σ = 390727260. Its totient is φ = 86828272.

The previous prime is 217070677. The next prime is 217070719. The reversal of 217070690 is 96070712.

It can be written as a sum of positive squares in 2 ways, for example, as 204404209 + 12666481 = 14297^2 + 3559^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×217070690² = 94239368914152200, which contains 22 as substring.

It is a Curzon 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 3 ways as a sum of consecutive naturals, for example, 10853525 + ... + 10853544.

Almost surely, 2^217070690 is an apocalyptic number.

217070690 is a deficient number, since it is larger than the sum of its proper divisors (173656570).

217070690 is a wasteful number, since it uses less digits than its factorization.

217070690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21707076.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 217070690 is about 14733.3190422253. The cubic root of 217070690 is about 600.9897460698.

The spelling of 217070690 in words is "two hundred seventeen million, seventy thousand, six hundred ninety".