81803431488 has 28 divisors (see below), whose sum is σ = 216438246320. Its totient is φ = 27267810432.

The previous prime is 81803431483. The next prime is 81803431543. The reversal of 81803431488 is 88413430818.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (81803431481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213029578 + ... + 213029961.

Almost surely, 2^81803431488 is an apocalyptic number.

It is an amenable number.

81803431488 is an abundant number, since it is smaller than the sum of its proper divisors (134634814832).

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

81803431488 is a wasteful number, since it uses less digits than its factorization.

81803431488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426059554 (or 426059544 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 48.

The spelling of 81803431488 in words is "eighty-one billion, eight hundred three million, four hundred thirty-one thousand, four hundred eighty-eight".