686519424 has 96 divisors (see below), whose sum is σ = 2021619600. Its totient is φ = 223501824.

The previous prime is 686519417. The next prime is 686519429. The reversal of 686519424 is 424915686.

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

It is a self number, because there is not a number n which added to its sum of digits gives 686519424.

It is not an unprimeable number, because it can be changed into a prime (686519429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42607 + ... + 56465.

Almost surely, 2^686519424 is an apocalyptic number.

686519424 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686519424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1010809800).

686519424 is an abundant number, since it is smaller than the sum of its proper divisors (1335100176).

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

686519424 is a wasteful number, since it uses less digits than its factorization.

686519424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13922 (or 13907 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 686519424 is about 26201.5156813494. The cubic root of 686519424 is about 882.1672751056.

The spelling of 686519424 in words is "six hundred eighty-six million, five hundred nineteen thousand, four hundred twenty-four".