81086960 has 80 divisors (see below), whose sum is σ = 198844416. Its totient is φ = 30691584.

The previous prime is 81086959. The next prime is 81086963. The reversal of 81086960 is 6968018.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81086963) 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 15 ways as a sum of consecutive naturals, for example, 233507 + ... + 233853.

Almost surely, 2^81086960 is an apocalyptic number.

81086960 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81086960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99422208).

81086960 is an abundant number, since it is smaller than the sum of its proper divisors (117757456).

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

81086960 is a wasteful number, since it uses less digits than its factorization.

81086960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510 (or 504 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 81086960 is about 9004.8298151603. The cubic root of 81086960 is about 432.8296527802.

The spelling of 81086960 in words is "eighty-one million, eighty-six thousand, nine hundred sixty".