686717944 has 16 divisors (see below), whose sum is σ = 1404650520. Its totient is φ = 312144480.

The previous prime is 686717929. The next prime is 686717947. The reversal of 686717944 is 449717686.

It is a super-2 number, since 2×686717944² = 943163069223174272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 686717891 and 686717900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686717947) 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 3 ways as a sum of consecutive naturals, for example, 3901719 + ... + 3901894.

Almost surely, 2^686717944 is an apocalyptic number.

It is an amenable number.

686717944 is an abundant number, since it is smaller than the sum of its proper divisors (717932576).

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

686717944 is a wasteful number, since it uses less digits than its factorization.

686717944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7803630 (or 7803626 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 52.

The square root of 686717944 is about 26205.3037379840. The cubic root of 686717944 is about 882.2522986623.

The spelling of 686717944 in words is "six hundred eighty-six million, seven hundred seventeen thousand, nine hundred forty-four".