81127748 has 12 divisors (see below), whose sum is σ = 152894700. Its totient is φ = 37443552.

The previous prime is 81127691. The next prime is 81127759. The reversal of 81127748 is 84772118.

It can be written as a sum of positive squares in 2 ways, for example, as 32239684 + 48888064 = 5678^2 + 6992^2 .

It is a super-2 number, since 2×81127748² = 13163422991103008, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 780023 + ... + 780126.

It is an arithmetic number, because the mean of its divisors is an integer number (12741225).

Almost surely, 2^81127748 is an apocalyptic number.

It is an amenable number.

81127748 is a deficient number, since it is larger than the sum of its proper divisors (71766952).

81127748 is a wasteful number, since it uses less digits than its factorization.

81127748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560166 (or 1560164 counting only the distinct ones).

The product of its digits is 25088, while the sum is 38.

The square root of 81127748 is about 9007.0943150386. The cubic root of 81127748 is about 432.9022139606.

The spelling of 81127748 in words is "eighty-one million, one hundred twenty-seven thousand, seven hundred forty-eight".