686784648 has 128 divisors (see below), whose sum is σ = 1938816000. Its totient is φ = 200928000.

The previous prime is 686784629. The next prime is 686784667. The reversal of 686784648 is 846487686.

It is an interprime number because it is at equal distance from previous prime (686784629) and next prime (686784667).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1146253 + ... + 1146851.

It is an arithmetic number, because the mean of its divisors is an integer number (15147000).

Almost surely, 2^686784648 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 686784648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (969408000).

686784648 is an abundant number, since it is smaller than the sum of its proper divisors (1252031352).

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

686784648 is a wasteful number, since it uses less digits than its factorization.

686784648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763 (or 759 counting only the distinct ones).

The product of its digits is 12386304, while the sum is 57.

The square root of 686784648 is about 26206.5764265384. The cubic root of 686784648 is about 882.2808634477.

The spelling of 686784648 in words is "six hundred eighty-six million, seven hundred eighty-four thousand, six hundred forty-eight".