81068120 has 64 divisors (see below), whose sum is σ = 209260800. Its totient is φ = 27688320.

The previous prime is 81068089. The next prime is 81068129. The reversal of 81068120 is 2186018.

It is a self number, because there is not a number n which added to its sum of digits gives 81068120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81068129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116975 + ... + 117665.

It is an arithmetic number, because the mean of its divisors is an integer number (3269700).

Almost surely, 2^81068120 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 81068120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104630400).

81068120 is an abundant number, since it is smaller than the sum of its proper divisors (128192680).

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

81068120 is a wasteful number, since it uses less digits than its factorization.

81068120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128 (or 1124 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 81068120 is about 9003.7836491111. The cubic root of 81068120 is about 432.7961285149.

The spelling of 81068120 in words is "eighty-one million, sixty-eight thousand, one hundred twenty".