*Nikkei rises 3.6 percent, biggest percentage gain in 5 mths
*Financial shares surge after bailout of Fannie, Freddie
*Exporters gain on soft yen, improved investor confidence (Adds stocks, details)
By Aiko Hayashi
TOKYO, Sept 8 (Reuters) - The Nikkei average jumped 3.6 percent on Monday, its biggest percentage gain in five months, with financial issues soaring on the U.S. government's bailout of troubled mortgage finance companies Fannie Mae <FNM.N> and Freddie Mac <FRE.N>.
Japan's biggest banks made double-digit gains, while Canon Inc <7751.T> and other exporters powered higher on a softer yen and improved investor sentiment, helping the benchmark to erase the sharp losses it booked on Friday on the gloomy outlook for the global economy.
"We seem to have hit bottom for now," said Takahiko Murai, general manager of equities at Nozomi Securities.
"It's a huge step forward now that the U.S. government has started taking drastic measures to deal with financial problems -- one of the two problems we have faced along with the economy."
The takeover of the U.S. finance companies is the latest move by Washington to shore up the slumping housing market and was taken to ward off more global financial market turbulence. [
] [ ]U.S. stock index futures surged on Sunday, pointing to a sharply higher opening on Wall Street on Monday after the news. [
]The benchmark Nikkei average <
> added 438.04 points to end the morning session at 12,650.27, the biggest percentage gain since a 4.2 percent advance logged on April 2.The broader Topix <
> shot up 4 percent to 1,217.33.The dollar climbed 0.7 percent to 108.55 yen <JPY=> and at one point climed as high as 109.05 on EBS. Investors welcome a softer yen as it boosts exporters' overseas profits when they are brought home.
Still, Nozomi's Murai said further gains in the market may be limited due to continuing worries about the global economy.
"The global economy won't recover right away simply because the U.S. has started taking care of its financial problems."
FINANCIAL SHARES IN FAVOUR
Industry leader Mitsubishi UFJ Financial Group <8306.T> soared 11.6 percent to 837 yen, while No.2 Mizuho Financial Group <8411.T> shot up 11.4 percent to 460,000 yen and Sumitomo Mitsui Financial Group <8316.T>, the third-biggest bank, jumped 11.1 percent to 650,000 yen.
The banking subindex <.IBNKS.T> surged 10.7 percent to become the biggest positive contributor among subindices.
"Moves like this probably won't be limited to Japan, and we may see similar advances in Chinese megabank shares, for instance," said Masayoshi Okamoto, head of dealing at Jujiya Securities.
Other financials also gained sharply, with Japan's biggest brokerage Nomura Holdings <8604.T> up 9.1 percent at 1,492 yen and Sumitomo Trust and Banking Co Ltd <8403.T> rising 15.3 percent to 677 yen.
Exporters also buoyed the overall market. Canon gained 3 percent to 4,770 yen and Toyota Motor Corp <7203.T> gained 4.6 percent to 4,970 yen.
Trade picked up on the Tokyo exchange's first section, with 968 million shares changing hands, above last week's morning average of 859 million.
Advancing shares beat declining ones by nearly 14 to 1. (Editing by Edwina Gibbs)