81871446 has 16 divisors (see below), whose sum is σ = 163833264. Its totient is φ = 27275424.

The previous prime is 81871423. The next prime is 81871457. The reversal of 81871446 is 64417818.

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 7 ways as a sum of consecutive naturals, for example, 15976 + ... + 20468.

It is an arithmetic number, because the mean of its divisors is an integer number (10239579).

Almost surely, 2^81871446 is an apocalyptic number.

81871446 is an abundant number, since it is smaller than the sum of its proper divisors (81961818).

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

81871446 is a wasteful number, since it uses less digits than its factorization.

81871446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7535.

The product of its digits is 43008, while the sum is 39.

The square root of 81871446 is about 9048.2841467319. The cubic root of 81871446 is about 434.2209971187.

The spelling of 81871446 in words is "eighty-one million, eight hundred seventy-one thousand, four hundred forty-six".