686081800 has 48 divisors (see below), whose sum is σ = 1602397440. Its totient is φ = 273184320.

The previous prime is 686081783. The next prime is 686081819. The reversal of 686081800 is 8180686.

It is a self number, because there is not a number n which added to its sum of digits gives 686081800.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36909 + ... + 52291.

It is an arithmetic number, because the mean of its divisors is an integer number (33383280).

Almost surely, 2^686081800 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 686081800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (801198720).

686081800 is an abundant number, since it is smaller than the sum of its proper divisors (916315640).

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

686081800 is a wasteful number, since it uses less digits than its factorization.

686081800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15622 (or 15613 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 686081800 is about 26193.1632301255. The cubic root of 686081800 is about 881.9797884794.

The spelling of 686081800 in words is "six hundred eighty-six million, eighty-one thousand, eight hundred".