686805788 has 12 divisors (see below), whose sum is σ = 1203193992. Its totient is φ = 343036080.

The previous prime is 686805781. The next prime is 686805793. The reversal of 686805788 is 887508686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686805781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87470 + ... + 94997.

It is an arithmetic number, because the mean of its divisors is an integer number (100266166).

Almost surely, 2^686805788 is an apocalyptic number.

It is an amenable number.

686805788 is a deficient number, since it is larger than the sum of its proper divisors (516388204).

686805788 is a wasteful number, since it uses less digits than its factorization.

686805788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183412 (or 183410 counting only the distinct ones).

The product of its (nonzero) digits is 5160960, while the sum is 56.

The square root of 686805788 is about 26206.9797573089. The cubic root of 686805788 is about 882.2899158856.

The spelling of 686805788 in words is "six hundred eighty-six million, eight hundred five thousand, seven hundred eighty-eight".