686805812 has 24 divisors (see below), whose sum is σ = 1498486080. Its totient is φ = 267586560.

The previous prime is 686805809. The next prime is 686805817. The reversal of 686805812 is 218508686.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686805817) 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 7 ways as a sum of consecutive naturals, for example, 1114637 + ... + 1115252.

It is an arithmetic number, because the mean of its divisors is an integer number (62436920).

Almost surely, 2^686805812 is an apocalyptic number.

It is an amenable number.

686805812 is an abundant number, since it is smaller than the sum of its proper divisors (811680268).

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

686805812 is a wasteful number, since it uses less digits than its factorization.

686805812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2229911 (or 2229909 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 44.

The square root of 686805812 is about 26206.9802152022. The cubic root of 686805812 is about 882.2899261626.

The spelling of 686805812 in words is "six hundred eighty-six million, eight hundred five thousand, eight hundred twelve".