717668645 has 8 divisors (see below), whose sum is σ = 864554904. Its totient is φ = 571899904.

The previous prime is 717668629. The next prime is 717668683. The reversal of 717668645 is 546866717.

It can be written as a sum of positive squares in 4 ways, for example, as 70576801 + 647091844 = 8401^2 + 25438^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 717668645 - 2⁴ = 717668629 is a prime.

It is a super-2 number, since 2×717668645² = 1030096568032272050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 717668593 and 717668602.

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 7 ways as a sum of consecutive naturals, for example, 277964 + ... + 280533.

It is an arithmetic number, because the mean of its divisors is an integer number (108069363).

Almost surely, 2^717668645 is an apocalyptic number.

It is an amenable number.

717668645 is a deficient number, since it is larger than the sum of its proper divisors (146886259).

717668645 is a wasteful number, since it uses less digits than its factorization.

717668645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558759.

The product of its digits is 1693440, while the sum is 50.

The square root of 717668645 is about 26789.3382710361. The cubic root of 717668645 is about 895.3125194718.

The spelling of 717668645 in words is "seven hundred seventeen million, six hundred sixty-eight thousand, six hundred forty-five".