717217668 has 18 divisors (see below), whose sum is σ = 1812966974. Its totient is φ = 239072544.

The previous prime is 717217663. The next prime is 717217679. The reversal of 717217668 is 866712717.

It can be written as a sum of positive squares in only one way, i.e., 584092224 + 133125444 = 24168^2 + 11538^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (717217661) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 9961321 + ... + 9961392.

Almost surely, 2^717217668 is an apocalyptic number.

It is an amenable number.

717217668 is an abundant number, since it is smaller than the sum of its proper divisors (1095749306).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

717217668 is a wasteful number, since it uses less digits than its factorization.

717217668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19922723 (or 19922718 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 717217668 is about 26780.9198497736. The cubic root of 717217668 is about 895.1249445324.

The spelling of 717217668 in words is "seven hundred seventeen million, two hundred seventeen thousand, six hundred sixty-eight".