81126760 has 96 divisors (see below), whose sum is σ = 215822880. Its totient is φ = 27206400.

The previous prime is 81126733. The next prime is 81126779. The reversal of 81126760 is 6762118.

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, 73815 + ... + 74905.

It is an arithmetic number, because the mean of its divisors is an integer number (2248155).

Almost surely, 2^81126760 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 81126760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107911440).

81126760 is an abundant number, since it is smaller than the sum of its proper divisors (134696120).

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

81126760 is a wasteful number, since it uses less digits than its factorization.

81126760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139 (or 1122 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 81126760 is about 9007.0394692152. The cubic root of 81126760 is about 432.9004566123.

Adding to 81126760 its reverse (6762118), we get a palindrome (87888878).

The spelling of 81126760 in words is "eighty-one million, one hundred twenty-six thousand, seven hundred sixty".