The phrase "a remarkable sum" is correct and usable in written English.
It can be used when referring to an amount of money or a quantity that is notably large or impressive.
Example: "The charity received a remarkable sum in donations this year, allowing them to expand their programs significantly."
Alternatives: "an impressive amount" or "a significant total".
A remarkable sum for such a small country.
All the same, £9m – even when judged against the banking industry's otherworldly yardsticks – is a remarkable sum.
"It's a remarkable sum to be starting the election cycle with," said Douglas Weber, a researcher for the center.
It is a remarkable sum of money for a player who does not turn 20 until December and who has scored only 11 senior Ligue 1 goals.
It was a remarkable sum, and it underscored how important a role national Democratic leaders believed the Torricelli race had in their overall drive to maintain the party's one-vote majority in the Senate.
On average, attendees will spend more than $1,000 each — a remarkable sum given that the average ticket price to the top 100 tours in North America is about $75, according to Pollstar.
According to the Brennan Center, approximately $3.5 million in special interest money was spent on the race – a truly remarkable sum for a judicial election where the return of the incumbent is a forgone conclusion before the race even begins.
Then an obscure state senator, Mr Foster paid Mr Duke the remarkable sum of $150,000 for a list of voters worth contacting.
His fluency enabled him to fulfil between tours a contract from The Pictorial Review for ten short stories at the remarkable sum of $1,350 apiece.
They arrive at the remarkable sum of $57 trillion in 1992 dollars, equivalent to six times the value of America's entire output of tangible goods and services in 1999.
This passage, while not remarkable, sums up the sombre and even weary tone of renewal that Obama used throughout: We understand that outworn programs are inadequate to the needs of our time.
