686804080 has 80 divisors (see below), whose sum is σ = 1696766400. Its totient is φ = 257642496.

The previous prime is 686804059. The next prime is 686804113. The reversal of 686804080 is 80408686.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 473917 + ... + 475363.

It is an arithmetic number, because the mean of its divisors is an integer number (21209580).

Almost surely, 2^686804080 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 686804080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (848383200).

686804080 is an abundant number, since it is smaller than the sum of its proper divisors (1009962320).

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

686804080 is a wasteful number, since it uses less digits than its factorization.

686804080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1826 (or 1820 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 686804080 is about 26206.9471705500. The cubic root of 686804080 is about 882.2891845034.

The spelling of 686804080 in words is "six hundred eighty-six million, eight hundred four thousand, eighty".