Strange that one petition has suddenly taken off - is it down to Twitter and Facebook?
As well as the one with 5.27 million votes (so far), on the first two pages of the government’s list of thousands of petitions I found the following:

Revoke Art.50 if there is no Brexit plan by the 25 of February
147,652 signatures
Grant a People's Vote if Parliament rejects the EU Withdrawal Agreement
141,192 signatures
Hold a second referendum on EU membership.
118,949 signatures
Stop Brexit if parliament rejects the deal
31,759 signatures
Repeal the EU Withdrawal Act to Prevent Accidental No-deal Brexit
14,351 signatures
Halt Brexit For A Public Inquiry
12,446 signatures

And for balance, supporting the other side I also found these:

Leave the EU without a deal in March 2019.
529,977 signatures
Parliament must honour the Referendum result. Leave deal or no deal 29/03/19
102,181 signatures
Walk away now! We voted for a No Deal Brexit
36,147 signatures
Ban the EU flag from UK Armed Forces uniforms.
18,454 signatures
Leave with No Deal if Parliament rejects the EU Withdrawal Agreement.
5,929 signatures