686860611840 has 864 divisors, whose sum is σ = 2726384134656. Its totient is φ = 164467998720.

The previous prime is 686860611839. The next prime is 686860611859. The reversal of 686860611840 is 48116068686.

It is a tau number, because it is divible by the number of its divisors (864).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 149607945 + ... + 149612535.

Almost surely, 2^686860611840 is an apocalyptic number.

686860611840 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 686860611840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1363192067328).

686860611840 is an abundant number, since it is smaller than the sum of its proper divisors (2039523522816).

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

686860611840 is a wasteful number, since it uses less digits than its factorization.

686860611840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4677 (or 4651 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 54.

The spelling of 686860611840 in words is "six hundred eighty-six billion, eight hundred sixty million, six hundred eleven thousand, eight hundred forty".