81127866 has 32 divisors (see below), whose sum is σ = 165725568. Its totient is φ = 26470080.

The previous prime is 81127817. The next prime is 81127867. The reversal of 81127866 is 66872118.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81127867) 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, 66276 + ... + 67488.

It is an arithmetic number, because the mean of its divisors is an integer number (5178924).

Almost surely, 2^81127866 is an apocalyptic number.

81127866 is an abundant number, since it is smaller than the sum of its proper divisors (84597702).

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

81127866 is a wasteful number, since it uses less digits than its factorization.

81127866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1446.

The product of its digits is 32256, while the sum is 39.

The square root of 81127866 is about 9007.1008654283. The cubic root of 81127866 is about 432.9024238453.

The spelling of 81127866 in words is "eighty-one million, one hundred twenty-seven thousand, eight hundred sixty-six".