81282557800 has 48 divisors (see below), whose sum is σ = 190853102700. Its totient is φ = 32191104000.

The previous prime is 81282557791. The next prime is 81282557831. The reversal of 81282557800 is 875528218.

It can be written as a sum of positive squares in 6 ways, for example, as 33612822244 + 47669735556 = 183338^2 + 218334^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1991745 + ... + 2032144.

Almost surely, 2^81282557800 is an apocalyptic number.

It is an amenable number.

81282557800 is an abundant number, since it is smaller than the sum of its proper divisors (109570544900).

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

81282557800 is a wasteful number, since it uses less digits than its factorization.

81282557800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4024006 (or 4023997 counting only the distinct ones).

The product of its (nonzero) digits is 358400, while the sum is 46.

The spelling of 81282557800 in words is "eighty-one billion, two hundred eighty-two million, five hundred fifty-seven thousand, eight hundred".