686020780 has 12 divisors (see below), whose sum is σ = 1440643680. Its totient is φ = 274408304.

The previous prime is 686020759. The next prime is 686020799. The reversal of 686020780 is 87020686.

686020780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17150500 + ... + 17150539.

It is an arithmetic number, because the mean of its divisors is an integer number (120053640).

Almost surely, 2^686020780 is an apocalyptic number.

It is an amenable number.

686020780 is an abundant number, since it is smaller than the sum of its proper divisors (754622900).

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

686020780 is a wasteful number, since it uses less digits than its factorization.

686020780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34301048 (or 34301046 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 686020780 is about 26191.9983964569. The cubic root of 686020780 is about 881.9536399928.

The spelling of 686020780 in words is "six hundred eighty-six million, twenty thousand, seven hundred eighty".