81716804 has 12 divisors (see below), whose sum is σ = 154004844. Its totient is φ = 37715424.

The previous prime is 81716749. The next prime is 81716827. The reversal of 81716804 is 40861718.

It can be written as a sum of positive squares in 2 ways, for example, as 20720704 + 60996100 = 4552^2 + 7810^2 .

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, 785687 + ... + 785790.

It is an arithmetic number, because the mean of its divisors is an integer number (12833737).

Almost surely, 2^81716804 is an apocalyptic number.

It is an amenable number.

81716804 is a deficient number, since it is larger than the sum of its proper divisors (72288040).

81716804 is a wasteful number, since it uses less digits than its factorization.

81716804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571494 (or 1571492 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 81716804 is about 9039.7347306212. The cubic root of 81716804 is about 433.9474335875.

The spelling of 81716804 in words is "eighty-one million, seven hundred sixteen thousand, eight hundred four".