686039424 has 128 divisors (see below), whose sum is σ = 2150062080. Its totient is φ = 189665280.

The previous prime is 686039411. The next prime is 686039443. The reversal of 686039424 is 424930686.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 79212 + ... + 87444.

It is an arithmetic number, because the mean of its divisors is an integer number (16797360).

Almost surely, 2^686039424 is an apocalyptic number.

686039424 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 686039424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1075031040).

686039424 is an abundant number, since it is smaller than the sum of its proper divisors (1464022656).

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

686039424 is a wasteful number, since it uses less digits than its factorization.

686039424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8288 (or 8276 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 42.

The square root of 686039424 is about 26192.3543042622. The cubic root of 686039424 is about 881.9616295441.

The spelling of 686039424 in words is "six hundred eighty-six million, thirty-nine thousand, four hundred twenty-four".