81341872 has 40 divisors (see below), whose sum is σ = 168645456. Its totient is φ = 37871616.

The previous prime is 81341867. The next prime is 81341893. The reversal of 81341872 is 27814318.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24843 + ... + 27925.

Almost surely, 2^81341872 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 81341872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84322728).

81341872 is an abundant number, since it is smaller than the sum of its proper divisors (87303584).

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

81341872 is a wasteful number, since it uses less digits than its factorization.

81341872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3205 (or 3199 counting only the distinct ones).

The product of its digits is 10752, while the sum is 34.

The square root of 81341872 is about 9018.9728905236. The cubic root of 81341872 is about 433.2827386031.

The spelling of 81341872 in words is "eighty-one million, three hundred forty-one thousand, eight hundred seventy-two".