217680997028 has 24 divisors (see below), whose sum is σ = 416641155840. Its totient is φ = 98691540320.

The previous prime is 217680997013. The next prime is 217680997031. The reversal of 217680997028 is 820799086712.

217680997028 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×217680997028³ (a number of 35 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6341876 + ... + 6376107.

It is an arithmetic number, because the mean of its divisors is an integer number (17360048160).

Almost surely, 2^217680997028 is an apocalyptic number.

It is an amenable number.

217680997028 is a deficient number, since it is larger than the sum of its proper divisors (198960158812).

217680997028 is a wasteful number, since it uses less digits than its factorization.

217680997028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12718387 (or 12718385 counting only the distinct ones).

The product of its (nonzero) digits is 6096384, while the sum is 59.

The spelling of 217680997028 in words is "two hundred seventeen billion, six hundred eighty million, nine hundred ninety-seven thousand, twenty-eight".