81731704 has 16 divisors (see below), whose sum is σ = 155760120. Its totient is φ = 40195680.

The previous prime is 81731701. The next prime is 81731743. The reversal of 81731704 is 40713718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81731701) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 83254 + ... + 84229.

Almost surely, 2^81731704 is an apocalyptic number.

It is an amenable number.

81731704 is a deficient number, since it is larger than the sum of its proper divisors (74028416).

81731704 is a wasteful number, since it uses less digits than its factorization.

81731704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167550 (or 167546 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 81731704 is about 9040.5588322847. The cubic root of 81731704 is about 433.9738068812.

The spelling of 81731704 in words is "eighty-one million, seven hundred thirty-one thousand, seven hundred four".