686557344 has 96 divisors (see below), whose sum is σ = 1972615680. Its totient is φ = 207353600.

The previous prime is 686557327. The next prime is 686557349. The reversal of 686557344 is 443755686.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 686557293 and 686557302.

It is not an unprimeable number, because it can be changed into a prime (686557349) 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, 378199 + ... + 380009.

It is an arithmetic number, because the mean of its divisors is an integer number (20548080).

Almost surely, 2^686557344 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 686557344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (986307840).

686557344 is an abundant number, since it is smaller than the sum of its proper divisors (1286058336).

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

686557344 is a wasteful number, since it uses less digits than its factorization.

686557344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2194 (or 2186 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 48.

The square root of 686557344 is about 26202.2392936176. The cubic root of 686557344 is about 882.1835170190.

The spelling of 686557344 in words is "six hundred eighty-six million, five hundred fifty-seven thousand, three hundred forty-four".