686267671040 has 160 divisors (see below), whose sum is σ = 1924230591360. Its totient is φ = 229819613184.

The previous prime is 686267670989. The next prime is 686267671099. The reversal of 686267671040 is 40176762686.

It is a tau number, because it is divible by the number of its divisors (160).

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 325256 + ... + 1215864.

It is an arithmetic number, because the mean of its divisors is an integer number (12026441196).

Almost surely, 2^686267671040 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 686267671040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (962115295680).

686267671040 is an abundant number, since it is smaller than the sum of its proper divisors (1237962920320).

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

686267671040 is an equidigital number, since it uses as much as digits as its factorization.

686267671040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890682 (or 890666 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 53.

The spelling of 686267671040 in words is "six hundred eighty-six billion, two hundred sixty-seven million, six hundred seventy-one thousand, forty".