81289204448 has 24 divisors (see below), whose sum is σ = 160054084512. Its totient is φ = 40640548096.

The previous prime is 81289204441. The next prime is 81289204457. The reversal of 81289204448 is 84440298218.

It is a junction number, because it is equal to n+sod(n) for n = 81289204396 and 81289204405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81289204441) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 213161 + ... + 456087.

It is an arithmetic number, because the mean of its divisors is an integer number (6668920188).

Almost surely, 2^81289204448 is an apocalyptic number.

It is an amenable number.

81289204448 is a deficient number, since it is larger than the sum of its proper divisors (78764880064).

81289204448 is a wasteful number, since it uses less digits than its factorization.

81289204448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253394 (or 253386 counting only the distinct ones).

The product of its (nonzero) digits is 1179648, while the sum is 50.

The spelling of 81289204448 in words is "eighty-one billion, two hundred eighty-nine million, two hundred four thousand, four hundred forty-eight".