81064823 has 16 divisors (see below), whose sum is σ = 99348480. Its totient is φ = 64561536.

The previous prime is 81064787. The next prime is 81064829. The reversal of 81064823 is 32846018.

It is a cyclic number.

It is not a de Polignac number, because 81064823 - 2⁶ = 81064759 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81064823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81064829) 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 in 15 ways as a sum of consecutive naturals, for example, 5090 + ... + 13712.

It is an arithmetic number, because the mean of its divisors is an integer number (6209280).

Almost surely, 2^81064823 is an apocalyptic number.

81064823 is a deficient number, since it is larger than the sum of its proper divisors (18283657).

81064823 is a wasteful number, since it uses less digits than its factorization.

81064823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8726.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 81064823 is about 9003.6005575547. The cubic root of 81064823 is about 432.7902612345.

The spelling of 81064823 in words is "eighty-one million, sixty-four thousand, eight hundred twenty-three".