81323412 has 24 divisors (see below), whose sum is σ = 193336416. Its totient is φ = 26596128.

The previous prime is 81323383. The next prime is 81323419. The reversal of 81323412 is 21432318.

It is a super-2 number, since 2×81323412² = 13226994678643488, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81323419) 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, 63298 + ... + 64569.

It is an arithmetic number, because the mean of its divisors is an integer number (8055684).

Almost surely, 2^81323412 is an apocalyptic number.

It is an amenable number.

81323412 is an abundant number, since it is smaller than the sum of its proper divisors (112013004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81323412 is a wasteful number, since it uses less digits than its factorization.

81323412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127927 (or 127925 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 81323412 is about 9017.9494343226. The cubic root of 81323412 is about 433.2499592391.

The spelling of 81323412 in words is "eighty-one million, three hundred twenty-three thousand, four hundred twelve".