686633860 has 72 divisors (see below), whose sum is σ = 1595361600. Its totient is φ = 248043840.

The previous prime is 686633833. The next prime is 686633861. The reversal of 686633860 is 68336686.

It is a self number, because there is not a number n which added to its sum of digits gives 686633860.

It is not an unprimeable number, because it can be changed into a prime (686633861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 403291 + ... + 404989.

It is an arithmetic number, because the mean of its divisors is an integer number (22157800).

Almost surely, 2^686633860 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 686633860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (797680800).

686633860 is an abundant number, since it is smaller than the sum of its proper divisors (908727740).

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

686633860 is a wasteful number, since it uses less digits than its factorization.

686633860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1897 (or 1884 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 46.

The square root of 686633860 is about 26203.6993571518. The cubic root of 686633860 is about 882.2162885698.

The spelling of 686633860 in words is "six hundred eighty-six million, six hundred thirty-three thousand, eight hundred sixty".