81730744 has 16 divisors (see below), whose sum is σ = 156506400. Its totient is φ = 39995712.

The previous prime is 81730739. The next prime is 81730751. The reversal of 81730744 is 44703718.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108309 + ... + 109060.

It is an arithmetic number, because the mean of its divisors is an integer number (9781650).

Almost surely, 2^81730744 is an apocalyptic number.

It is an amenable number.

81730744 is a deficient number, since it is larger than the sum of its proper divisors (74775656).

81730744 is a wasteful number, since it uses less digits than its factorization.

81730744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217422 (or 217418 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 81730744 is about 9040.5057380658. The cubic root of 81730744 is about 433.9721077589.

The spelling of 81730744 in words is "eighty-one million, seven hundred thirty thousand, seven hundred forty-four".