686358720 has 168 divisors, whose sum is σ = 2396697264. Its totient is φ = 180246528.

The previous prime is 686358683. The next prime is 686358781. The reversal of 686358720 is 27853686.

686358720 is a `hidden beast` number, since 6 + 8 + 63 + 587 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 191182 + ... + 194738.

Almost surely, 2^686358720 is an apocalyptic number.

686358720 is a gapful number since it is divisible by the number (60) 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 686358720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1198348632).

686358720 is an abundant number, since it is smaller than the sum of its proper divisors (1710338544).

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

686358720 is a wasteful number, since it uses less digits than its factorization.

686358720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3647 (or 3634 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The square root of 686358720 is about 26198.4488090421. The cubic root of 686358720 is about 882.0984356486.

The spelling of 686358720 in words is "six hundred eighty-six million, three hundred fifty-eight thousand, seven hundred twenty".