688247217 has 12 divisors (see below), whose sum is σ = 1136154240. Its totient is φ = 393284088.

The previous prime is 688247177. The next prime is 688247243. The reversal of 688247217 is 712742886.

It is not a de Polignac number, because 688247217 - 2¹⁸ = 687985073 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (688247257) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 5462217 + ... + 5462342.

It is an arithmetic number, because the mean of its divisors is an integer number (94679520).

Almost surely, 2^688247217 is an apocalyptic number.

It is an amenable number.

688247217 is a deficient number, since it is larger than the sum of its proper divisors (447907023).

688247217 is a wasteful number, since it uses less digits than its factorization.

688247217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10924572 (or 10924569 counting only the distinct ones).

The product of its digits is 301056, while the sum is 45.

The square root of 688247217 is about 26234.4662038319. The cubic root of 688247217 is about 882.9067179138.

The spelling of 688247217 in words is "six hundred eighty-eight million, two hundred forty-seven thousand, two hundred seventeen".