81871062 has 96 divisors (see below), whose sum is σ = 212050944. Its totient is φ = 20865600.

The previous prime is 81871043. The next prime is 81871073. The reversal of 81871062 is 26017818.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 118137 + ... + 118827.

It is an arithmetic number, because the mean of its divisors is an integer number (2208864).

Almost surely, 2^81871062 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81871062, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106025472).

81871062 is an abundant number, since it is smaller than the sum of its proper divisors (130179882).

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

81871062 is a wasteful number, since it uses less digits than its factorization.

81871062 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754 (or 747 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 81871062 is about 9048.2629272143. The cubic root of 81871062 is about 434.2203182450.

The spelling of 81871062 in words is "eighty-one million, eight hundred seventy-one thousand, sixty-two".