686234784 has 96 divisors (see below), whose sum is σ = 1917820800. Its totient is φ = 214106112.

The previous prime is 686234777. The next prime is 686234803. The reversal of 686234784 is 487432686.

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 an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 323712 + ... + 325824.

It is an arithmetic number, because the mean of its divisors is an integer number (19977300).

Almost surely, 2^686234784 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 686234784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (958910400).

686234784 is an abundant number, since it is smaller than the sum of its proper divisors (1231586016).

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

686234784 is a wasteful number, since it uses less digits than its factorization.

686234784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2342 (or 2334 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 48.

The square root of 686234784 is about 26196.0833713744. The cubic root of 686234784 is about 882.0453388595.

The spelling of 686234784 in words is "six hundred eighty-six million, two hundred thirty-four thousand, seven hundred eighty-four".