686937840680 has 256 divisors, whose sum is σ = 1950646440960. Its totient is φ = 211888742400.

The previous prime is 686937840679. The next prime is 686937840683. The reversal of 686937840680 is 86048739686.

It is a Harshad number since it is a multiple of its sum of digits (65).

It is not an unprimeable number, because it can be changed into a prime (686937840683) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 215948690 + ... + 215951870.

It is an arithmetic number, because the mean of its divisors is an integer number (7619712660).

Almost surely, 2^686937840680 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686937840680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (975323220480).

686937840680 is an abundant number, since it is smaller than the sum of its proper divisors (1263708600280).

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

686937840680 is a wasteful number, since it uses less digits than its factorization.

686937840680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4700 (or 4696 counting only the distinct ones).

The product of its (nonzero) digits is 83607552, while the sum is 65.

The spelling of 686937840680 in words is "six hundred eighty-six billion, nine hundred thirty-seven million, eight hundred forty thousand, six hundred eighty".