81841736 has 32 divisors (see below), whose sum is σ = 159041280. Its totient is φ = 39441600.

The previous prime is 81841733. The next prime is 81841769. The reversal of 81841736 is 63714818.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 81841736.

It is not an unprimeable number, because it can be changed into a prime (81841733) by changing a digit.

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, 81590 + ... + 82586.

It is an arithmetic number, because the mean of its divisors is an integer number (4970040).

Almost surely, 2^81841736 is an apocalyptic number.

It is an amenable number.

81841736 is a deficient number, since it is larger than the sum of its proper divisors (77199544).

81841736 is a wasteful number, since it uses less digits than its factorization.

81841736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1365 (or 1361 counting only the distinct ones).

The product of its digits is 32256, while the sum is 38.

The square root of 81841736 is about 9046.6422500285. The cubic root of 81841736 is about 434.1684665265.

The spelling of 81841736 in words is "eighty-one million, eight hundred forty-one thousand, seven hundred thirty-six".