689880685 has 8 divisors (see below), whose sum is σ = 891538200. Its totient is φ = 509450304.

The previous prime is 689880683. The next prime is 689880721. The reversal of 689880685 is 586088986.

It can be written as a sum of positive squares in 4 ways, for example, as 9036036 + 680844649 = 3006^2 + 26093^2 .

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 689880685 - 2¹ = 689880683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689880683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5306710 + ... + 5306839.

It is an arithmetic number, because the mean of its divisors is an integer number (111442275).

Almost surely, 2^689880685 is an apocalyptic number.

689880685 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

689880685 is a deficient number, since it is larger than the sum of its proper divisors (201657515).

689880685 is a wasteful number, since it uses less digits than its factorization.

689880685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10613567.

The product of its (nonzero) digits is 6635520, while the sum is 58.

The square root of 689880685 is about 26265.5798527274. The cubic root of 689880685 is about 883.6046553105.

The spelling of 689880685 in words is "six hundred eighty-nine million, eight hundred eighty thousand, six hundred eighty-five".