81126744 has 16 divisors (see below), whose sum is σ = 202816920. Its totient is φ = 27042240.

The previous prime is 81126733. The next prime is 81126779. The reversal of 81126744 is 44762118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1690117 + ... + 1690164.

Almost surely, 2^81126744 is an apocalyptic number.

It is an amenable number.

81126744 is an abundant number, since it is smaller than the sum of its proper divisors (121690176).

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

81126744 is a wasteful number, since it uses less digits than its factorization.

81126744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3380290 (or 3380286 counting only the distinct ones).

The product of its digits is 10752, while the sum is 33.

The square root of 81126744 is about 9007.0385810210. The cubic root of 81126744 is about 432.9004281531.

The spelling of 81126744 in words is "eighty-one million, one hundred twenty-six thousand, seven hundred forty-four".