686467838736 has 160 divisors (see below), whose sum is σ = 2040400656000. Its totient is φ = 220711260672.

The previous prime is 686467838701. The next prime is 686467838737. The reversal of 686467838736 is 637838764686.

686467838736 is a `hidden beast` number, since 6 + 8 + 6 + 467 + 83 + 87 + 3 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (686467838737) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12739146 + ... + 12792918.

It is an arithmetic number, because the mean of its divisors is an integer number (12752504100).

Almost surely, 2^686467838736 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 686467838736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1020200328000).

686467838736 is an abundant number, since it is smaller than the sum of its proper divisors (1353932817264).

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

686467838736 is a wasteful number, since it uses less digits than its factorization.

686467838736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54838 (or 54826 counting only the distinct ones).

The product of its digits is 1170505728, while the sum is 72.

The spelling of 686467838736 in words is "six hundred eighty-six billion, four hundred sixty-seven million, eight hundred thirty-eight thousand, seven hundred thirty-six".