81704764 has 6 divisors (see below), whose sum is σ = 142983344. Its totient is φ = 40852380.

The previous prime is 81704761. The next prime is 81704789. The reversal of 81704764 is 46740718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81704761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10213092 + ... + 10213099.

Almost surely, 2^81704764 is an apocalyptic number.

It is an amenable number.

81704764 is a deficient number, since it is larger than the sum of its proper divisors (61278580).

81704764 is a wasteful number, since it uses less digits than its factorization.

81704764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20426195 (or 20426193 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 81704764 is about 9039.0687573444. The cubic root of 81704764 is about 433.9261202082.

The spelling of 81704764 in words is "eighty-one million, seven hundred four thousand, seven hundred sixty-four".