81062871408 has 240 divisors, whose sum is σ = 235458263040. Its totient is φ = 26018496000.

The previous prime is 81062871377. The next prime is 81062871413. The reversal of 81062871408 is 80417826018.

81062871408 is a `hidden beast` number, since 8 + 1 + 0 + 628 + 7 + 14 + 0 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 169233313 + ... + 169233791.

It is an arithmetic number, because the mean of its divisors is an integer number (981076096).

Almost surely, 2^81062871408 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 81062871408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117729131520).

81062871408 is an abundant number, since it is smaller than the sum of its proper divisors (154395391632).

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

81062871408 is a wasteful number, since it uses less digits than its factorization.

81062871408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868 (or 859 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 45.

The spelling of 81062871408 in words is "eighty-one billion, sixty-two million, eight hundred seventy-one thousand, four hundred eight".