217684082 has 48 divisors (see below), whose sum is σ = 434367360. Its totient is φ = 79812480.

The previous prime is 217684081. The next prime is 217684087. The reversal of 217684082 is 280486712.

It is not an unprimeable number, because it can be changed into a prime (217684081) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25019 + ... + 32577.

It is an arithmetic number, because the mean of its divisors is an integer number (9049320).

Almost surely, 2^217684082 is an apocalyptic number.

217684082 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

217684082 is a deficient number, since it is larger than the sum of its proper divisors (216683278).

217684082 is a wasteful number, since it uses less digits than its factorization.

217684082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7607 (or 7596 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 217684082 is about 14754.1208480885. The cubic root of 217684082 is about 601.5553001043. Note that the first 3 decimals are identical.

The spelling of 217684082 in words is "two hundred seventeen million, six hundred eighty-four thousand, eighty-two".