Eight division world champion Manny Pacquiao has invested in Gtoken, a Singaporean mobile gaming company, after recently hanging up his boxing gloves.

Details of the deal have not been disclosed, but Gtoken said the former world boxing champion had acquired a "meaningful" stake in the $60-million company.

Gtoken describes itself as a mobile gaming publisher, advertising company, and fast-growing crowdsourcing community. It is reported to have over a million users in China, Southeast Asia, and Taiwan.

Pacquiao has various business interests, primarily in General Santos, the city in the southern islands of Mindanao where he lives. These include a boxing gym, boutique hotel, and a convenience store. He was the richest congressman in the Philippines with an estimated net worth of 1.7 billion pesos ($36.84 million).

According to Forbes magazine, Pacquiao was the world's second highest-paid celebrity in 2015 behind boxer Floyd Mayweather, who he lost to in Las Vegas in May last year with an injured shoulder. Pacquiao's earnings last year were estimated at $160 million.

Pacquiao last boxed in April when he was awarded a unanimous decision against U.S. fighter Timothy Bradley. He won a seat in the Philippine senate in May, and confirmed his retirement from boxing to focus on a political career.

Pacquiao was a chronic absentee congressman for two three-year terms, and has lost sponsorship from companies like Nike and Wonderful Pistachios after homophobic comments in which he described gay people in a TV interview as "worse than animals".