81281602048 has 80 divisors (see below), whose sum is σ = 165419100000. Its totient is φ = 39888617472.

The previous prime is 81281602043. The next prime is 81281602057. The reversal of 81281602048 is 84020618218.

It is a super-3 number, since 3×81281602048³ (a number of 34 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81281602048.

It is not an unprimeable number, because it can be changed into a prime (81281602043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23228203 + ... + 23231701.

It is an arithmetic number, because the mean of its divisors is an integer number (2067738750).

Almost surely, 2^81281602048 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81281602048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82709550000).

81281602048 is an abundant number, since it is smaller than the sum of its proper divisors (84137497952).

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

81281602048 is an equidigital number, since it uses as much as digits as its factorization.

81281602048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4345 (or 4329 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 40.

The spelling of 81281602048 in words is "eighty-one billion, two hundred eighty-one million, six hundred two thousand, forty-eight".