81324304 has 20 divisors (see below), whose sum is σ = 157993360. Its totient is φ = 40551840.

The previous prime is 81324289. The next prime is 81324307. The reversal of 81324304 is 40342318.

It is a super-2 number, since 2×81324304² = 13227284842168832, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81324307) by changing a digit.

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, 642 + ... + 12769.

It is an arithmetic number, because the mean of its divisors is an integer number (7899668).

Almost surely, 2^81324304 is an apocalyptic number.

It is an amenable number.

81324304 is a deficient number, since it is larger than the sum of its proper divisors (76669056).

81324304 is a wasteful number, since it uses less digits than its factorization.

81324304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13798 (or 13792 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 81324304 is about 9017.9988911066. The cubic root of 81324304 is about 433.2515432748.

The spelling of 81324304 in words is "eighty-one million, three hundred twenty-four thousand, three hundred four".