686979591760 has 320 divisors, whose sum is σ = 2062539417600. Its totient is φ = 206486784000.

The previous prime is 686979591671. The next prime is 686979591797. The reversal of 686979591760 is 67195979686.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 187748811 + ... + 187752469.

It is an arithmetic number, because the mean of its divisors is an integer number (6445435680).

Almost surely, 2^686979591760 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 686979591760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1031269708800).

686979591760 is an abundant number, since it is smaller than the sum of its proper divisors (1375559825840).

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

686979591760 is a wasteful number, since it uses less digits than its factorization.

686979591760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4770 (or 4764 counting only the distinct ones).

The product of its (nonzero) digits is 308629440, while the sum is 73.

The spelling of 686979591760 in words is "six hundred eighty-six billion, nine hundred seventy-nine million, five hundred ninety-one thousand, seven hundred sixty".