81043724 has 12 divisors (see below), whose sum is σ = 143769864. Its totient is φ = 39966624.

The previous prime is 81043723. The next prime is 81043741. The reversal of 81043724 is 42734018.

It is not an unprimeable number, because it can be changed into a prime (81043723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138482 + ... + 139065.

It is an arithmetic number, because the mean of its divisors is an integer number (11980822).

Almost surely, 2^81043724 is an apocalyptic number.

It is an amenable number.

81043724 is a deficient number, since it is larger than the sum of its proper divisors (62726140).

81043724 is a wasteful number, since it uses less digits than its factorization.

81043724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277624 (or 277622 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 81043724 is about 9002.4287833895. The cubic root of 81043724 is about 432.7527100759.

The spelling of 81043724 in words is "eighty-one million, forty-three thousand, seven hundred twenty-four".