81090424507848 has 256 divisors, whose sum is σ = 242769081139200. Its totient is φ = 22068946817280.

The previous prime is 81090424507847. The next prime is 81090424507853. The reversal of 81090424507848 is 84870542409018.

It is a super-2 number, since 2×81090424507848² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81090424507791 and 81090424507800.

It is not an unprimeable number, because it can be changed into a prime (81090424507843) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3067991193 + ... + 3068017623.

It is an arithmetic number, because the mean of its divisors is an integer number (948316723200).

Almost surely, 2^{81090424507848} 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 81090424507848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121384540569600).

81090424507848 is an abundant number, since it is smaller than the sum of its proper divisors (161678656631352).

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

81090424507848 is a wasteful number, since it uses less digits than its factorization.

81090424507848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29752 (or 29748 counting only the distinct ones).

The product of its (nonzero) digits is 20643840, while the sum is 60.

The spelling of 81090424507848 in words is "eighty-one trillion, ninety billion, four hundred twenty-four million, five hundred seven thousand, eight hundred forty-eight".