81080766 has 48 divisors (see below), whose sum is σ = 190479744. Its totient is φ = 24777792.

The previous prime is 81080749. The next prime is 81080807. The reversal of 81080766 is 66708018.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 81080766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35635 + ... + 37841.

It is an arithmetic number, because the mean of its divisors is an integer number (3968328).

Almost surely, 2^81080766 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81080766, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95239872).

81080766 is an abundant number, since it is smaller than the sum of its proper divisors (109398978).

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

81080766 is a wasteful number, since it uses less digits than its factorization.

81080766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2385 (or 2382 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 81080766 is about 9004.4858820479. The cubic root of 81080766 is about 432.8186316282.

The spelling of 81080766 in words is "eighty-one million, eighty thousand, seven hundred sixty-six".