81481467040 has 192 divisors, whose sum is σ = 210662726400. Its totient is φ = 29685325824.

The previous prime is 81481467037. The next prime is 81481467083. The reversal of 81481467040 is 4076418418.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7785331 + ... + 7795789.

It is an arithmetic number, because the mean of its divisors is an integer number (1097201700).

Almost surely, 2^81481467040 is an apocalyptic number.

81481467040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81481467040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105331363200).

81481467040 is an abundant number, since it is smaller than the sum of its proper divisors (129181259360).

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

81481467040 is a wasteful number, since it uses less digits than its factorization.

81481467040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10599 (or 10591 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 43.

The spelling of 81481467040 in words is "eighty-one billion, four hundred eighty-one million, four hundred sixty-seven thousand, forty".