217340128 has 24 divisors (see below), whose sum is σ = 429929640. Its totient is φ = 108151680.

The previous prime is 217340119. The next prime is 217340141. The reversal of 217340128 is 821043712.

It is a super-3 number, since 3×217340128³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 217340096 and 217340105.

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 3 ways as a sum of consecutive naturals, for example, 9343 + ... + 22846.

It is an arithmetic number, because the mean of its divisors is an integer number (17913735).

Almost surely, 2^217340128 is an apocalyptic number.

It is an amenable number.

217340128 is a deficient number, since it is larger than the sum of its proper divisors (212589512).

217340128 is a wasteful number, since it uses less digits than its factorization.

217340128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32410 (or 32402 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 217340128 is about 14742.4600389487. The cubic root of 217340128 is about 601.2383018487.

The spelling of 217340128 in words is "two hundred seventeen million, three hundred forty thousand, one hundred twenty-eight".