81032768 has 28 divisors (see below), whose sum is σ = 161098992. Its totient is φ = 40440960.

The previous prime is 81032759. The next prime is 81032771. The reversal of 81032768 is 86723018.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52163 + ... + 53693.

Almost surely, 2^81032768 is an apocalyptic number.

It is an amenable number.

81032768 is a deficient number, since it is larger than the sum of its proper divisors (80066224).

81032768 is a wasteful number, since it uses less digits than its factorization.

81032768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2370 (or 2360 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 81032768 is about 9001.8202603696. The cubic root of 81032768 is about 432.7332084533.

The spelling of 81032768 in words is "eighty-one million, thirty-two thousand, seven hundred sixty-eight".