687194767360 has 76 divisors (see below), whose sum is σ = 1649267441658. Its totient is φ = 274877906944.

The previous prime is 687194767253. The next prime is 687194767367. The reversal of 687194767360 is 63767491786.

It can be written as a sum of positive squares in only one way, i.e., 618475290624 + 68719476736 = 786432^2 + 262144^2 .

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a nialpdrome in base 4 and base 16.

It is a zygodrome in base 4.

It is a junction number, because it is equal to n+sod(n) for n = 687194767292 and 687194767301.

It is not an unprimeable number, because it can be changed into a prime (687194767367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (2) of ones.

In principle, a polygon with 687194767360 sides can be constructed with ruler and compass.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137438953470 + ... + 137438953474.

Almost surely, 2^687194767360 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 687194767360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (824633720829).

687194767360 is an abundant number, since it is smaller than the sum of its proper divisors (962072674298).

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

687194767360 is an frugal number, since it uses more digits than its factorization.

687194767360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79 (or 7 counting only the distinct ones).

The product of its (nonzero) digits is 64012032, while the sum is 64.

The spelling of 687194767360 in words is "six hundred eighty-seven billion, one hundred ninety-four million, seven hundred sixty-seven thousand, three hundred sixty".