81027612 has 36 divisors (see below), whose sum is σ = 205132200. Its totient is φ = 26968032.

The previous prime is 81027599. The next prime is 81027613. The reversal of 81027612 is 21672018.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81027613) 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 11 ways as a sum of consecutive naturals, for example, 30514 + ... + 33062.

Almost surely, 2^81027612 is an apocalyptic number.

It is an amenable number.

81027612 is an abundant number, since it is smaller than the sum of its proper divisors (124104588).

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

81027612 is a wasteful number, since it uses less digits than its factorization.

81027612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3442 (or 3437 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 81027612 is about 9001.5338692914. The cubic root of 81027612 is about 432.7240301921.

The spelling of 81027612 in words is "eighty-one million, twenty-seven thousand, six hundred twelve".