686173516 has 48 divisors (see below), whose sum is σ = 1466047296. Its totient is φ = 274305024.

The previous prime is 686173493. The next prime is 686173519. The reversal of 686173516 is 615371686.

It is not an unprimeable number, because it can be changed into a prime (686173519) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47410 + ... + 60166.

It is an arithmetic number, because the mean of its divisors is an integer number (30542652).

Almost surely, 2^686173516 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686173516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (733023648).

686173516 is an abundant number, since it is smaller than the sum of its proper divisors (779873780).

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

686173516 is a wasteful number, since it uses less digits than its factorization.

686173516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12898 (or 12896 counting only the distinct ones).

The product of its digits is 181440, while the sum is 43.

The square root of 686173516 is about 26194.9139338155. The cubic root of 686173516 is about 882.0190879983.

The spelling of 686173516 in words is "six hundred eighty-six million, one hundred seventy-three thousand, five hundred sixteen".