686207816 has 96 divisors (see below), whose sum is σ = 1561472640. Its totient is φ = 276768000.

The previous prime is 686207791. The next prime is 686207827. The reversal of 686207816 is 618702686.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2206301 + ... + 2206611.

It is an arithmetic number, because the mean of its divisors is an integer number (16265340).

Almost surely, 2^686207816 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 686207816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (780736320).

686207816 is an abundant number, since it is smaller than the sum of its proper divisors (875264824).

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

686207816 is a wasteful number, since it uses less digits than its factorization.

686207816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427 (or 392 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 686207816 is about 26195.5686328814. The cubic root of 686207816 is about 882.0337843542.

The spelling of 686207816 in words is "six hundred eighty-six million, two hundred seven thousand, eight hundred sixteen".