81083612 has 12 divisors (see below), whose sum is σ = 142360680. Its totient is φ = 40409136.

The previous prime is 81083603. The next prime is 81083617. The reversal of 81083612 is 21638018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81083617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31787 + ... + 34242.

It is an arithmetic number, because the mean of its divisors is an integer number (11863390).

Almost surely, 2^81083612 is an apocalyptic number.

It is an amenable number.

81083612 is a deficient number, since it is larger than the sum of its proper divisors (61277068).

81083612 is a wasteful number, since it uses less digits than its factorization.

81083612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66340 (or 66338 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 81083612 is about 9004.6439130040. The cubic root of 81083612 is about 432.8236956628.

The spelling of 81083612 in words is "eighty-one million, eighty-three thousand, six hundred twelve".