686494506840 has 32 divisors (see below), whose sum is σ = 2059483520880. Its totient is φ = 183065201792.

The previous prime is 686494506839. The next prime is 686494506847. The reversal of 686494506840 is 48605494686.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686494506847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2860393659 + ... + 2860393898.

Almost surely, 2^686494506840 is an apocalyptic number.

686494506840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

686494506840 is an abundant number, since it is smaller than the sum of its proper divisors (1372989014040).

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

686494506840 is a wasteful number, since it uses less digits than its factorization.

686494506840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5720787571 (or 5720787567 counting only the distinct ones).

The product of its (nonzero) digits is 39813120, while the sum is 60.

The spelling of 686494506840 in words is "six hundred eighty-six billion, four hundred ninety-four million, five hundred six thousand, eight hundred forty".