686837408 has 48 divisors (see below), whose sum is σ = 1435008960. Its totient is φ = 322899456.

The previous prime is 686837407. The next prime is 686837413. The reversal of 686837408 is 804738686.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (686837407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35516 + ... + 51332.

It is an arithmetic number, because the mean of its divisors is an integer number (29896020).

Almost surely, 2^686837408 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 686837408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (717504480).

686837408 is an abundant number, since it is smaller than the sum of its proper divisors (748171552).

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

686837408 is a wasteful number, since it uses less digits than its factorization.

686837408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15909 (or 15901 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 50.

The square root of 686837408 is about 26207.5830247659. The cubic root of 686837408 is about 882.3034556564.

The spelling of 686837408 in words is "six hundred eighty-six million, eight hundred thirty-seven thousand, four hundred eight".