81364833 has 24 divisors (see below), whose sum is σ = 129426336. Its totient is φ = 48844800.

The previous prime is 81364831. The next prime is 81364847. The reversal of 81364833 is 33846318.

It is a happy number.

81364833 is a `hidden beast` number, since 8 + 1 + 3 + 648 + 3 + 3 = 666.

It is not a de Polignac number, because 81364833 - 2¹ = 81364831 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81364831) 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 23 ways as a sum of consecutive naturals, for example, 6753 + ... + 14433.

It is an arithmetic number, because the mean of its divisors is an integer number (5392764).

Almost surely, 2^81364833 is an apocalyptic number.

It is an amenable number.

81364833 is a deficient number, since it is larger than the sum of its proper divisors (48061503).

81364833 is a wasteful number, since it uses less digits than its factorization.

81364833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7805 (or 7802 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 81364833 is about 9020.2457283602. The cubic root of 81364833 is about 433.3235034588.

The spelling of 81364833 in words is "eighty-one million, three hundred sixty-four thousand, eight hundred thirty-three".