81236324 has 24 divisors (see below), whose sum is σ = 161159040. Its totient is φ = 35519904.

The previous prime is 81236321. The next prime is 81236329. The reversal of 81236324 is 42363218.

It is not an unprimeable number, because it can be changed into a prime (81236321) 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 7 ways as a sum of consecutive naturals, for example, 40124 + ... + 42099.

It is an arithmetic number, because the mean of its divisors is an integer number (6714960).

Almost surely, 2^81236324 is an apocalyptic number.

It is an amenable number.

81236324 is a deficient number, since it is larger than the sum of its proper divisors (79922716).

81236324 is a wasteful number, since it uses less digits than its factorization.

81236324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82259 (or 82257 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 81236324 is about 9013.1195487467. The cubic root of 81236324 is about 433.0952504125.

The spelling of 81236324 in words is "eighty-one million, two hundred thirty-six thousand, three hundred twenty-four".