81027216 has 100 divisors (see below), whose sum is σ = 237183232. Its totient is φ = 26702784.

The previous prime is 81027203. The next prime is 81027227. The reversal of 81027216 is 61272018.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 81027216.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 133185 + ... + 133791.

Almost surely, 2^81027216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81027216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118591616).

81027216 is an abundant number, since it is smaller than the sum of its proper divisors (156156016).

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

81027216 is a wasteful number, since it uses less digits than its factorization.

81027216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730 (or 715 counting only the distinct ones).

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

The square root of 81027216 is about 9001.5118730133. The cubic root of 81027216 is about 432.7233252513.

The spelling of 81027216 in words is "eighty-one million, twenty-seven thousand, two hundred sixteen".