81068847 has 4 divisors (see below), whose sum is σ = 108091800. Its totient is φ = 54045896.

The previous prime is 81068789. The next prime is 81068857. The reversal of 81068847 is 74886018.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81068847 - 2¹⁹ = 80544559 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81068799 and 81068808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81068857) 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, 13511472 + ... + 13511477.

It is an arithmetic number, because the mean of its divisors is an integer number (27022950).

Almost surely, 2^81068847 is an apocalyptic number.

81068847 is a deficient number, since it is larger than the sum of its proper divisors (27022953).

81068847 is a wasteful number, since it uses less digits than its factorization.

81068847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27022952.

The product of its (nonzero) digits is 86016, while the sum is 42.

The square root of 81068847 is about 9003.8240209369. The cubic root of 81068847 is about 432.7974222493.

The spelling of 81068847 in words is "eighty-one million, sixty-eight thousand, eight hundred forty-seven".