81734816 has 24 divisors (see below), whose sum is σ = 161125524. Its totient is φ = 40814080.

The previous prime is 81734803. The next prime is 81734869. The reversal of 81734816 is 61843718.

It can be written as a sum of positive squares in 2 ways, for example, as 74995600 + 6739216 = 8660^2 + 2596^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81734816.

It is an unprimeable number.

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, 37106 + ... + 39246.

Almost surely, 2^81734816 is an apocalyptic number.

It is an amenable number.

81734816 is a deficient number, since it is larger than the sum of its proper divisors (79390708).

81734816 is a wasteful number, since it uses less digits than its factorization.

81734816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3344 (or 3336 counting only the distinct ones).

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

The square root of 81734816 is about 9040.7309439005. The cubic root of 81734816 is about 433.9793147779.

The spelling of 81734816 in words is "eighty-one million, seven hundred thirty-four thousand, eight hundred sixteen".