716685689 has 4 divisors (see below), whose sum is σ = 721250724. Its totient is φ = 712120656.

The previous prime is 716685653. The next prime is 716685691. The reversal of 716685689 is 986586617.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 986586617 = 1787 ⋅552091.

It can be written as a sum of positive squares in 2 ways, for example, as 507015289 + 209670400 = 22517^2 + 14480^2 .

It is a cyclic number.

It is not a de Polignac number, because 716685689 - 2¹⁶ = 716620153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (716685649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2282282 + ... + 2282595.

It is an arithmetic number, because the mean of its divisors is an integer number (180312681).

Almost surely, 2^716685689 is an apocalyptic number.

It is an amenable number.

716685689 is a deficient number, since it is larger than the sum of its proper divisors (4565035).

716685689 is a wasteful number, since it uses less digits than its factorization.

716685689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4565034.

The product of its digits is 4354560, while the sum is 56.

The square root of 716685689 is about 26770.9859549476. The cubic root of 716685689 is about 894.9035773072.

The spelling of 716685689 in words is "seven hundred sixteen million, six hundred eighty-five thousand, six hundred eighty-nine".