81423049008 has 320 divisors, whose sum is σ = 262063226880. Its totient is φ = 21258547200.

The previous prime is 81423049007. The next prime is 81423049013. The reversal of 81423049008 is 80094032418.

It is not an unprimeable number, because it can be changed into a prime (81423049003) 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, 92420728 + ... + 92421608.

It is an arithmetic number, because the mean of its divisors is an integer number (818947584).

Almost surely, 2^81423049008 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 81423049008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131031613440).

81423049008 is an abundant number, since it is smaller than the sum of its proper divisors (180640177872).

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

81423049008 is a wasteful number, since it uses less digits than its factorization.

81423049008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1416 (or 1410 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The spelling of 81423049008 in words is "eighty-one billion, four hundred twenty-three million, forty-nine thousand, eight".