81128168 has 16 divisors (see below), whose sum is σ = 165944160. Its totient is φ = 36876400.

The previous prime is 81128137. The next prime is 81128171. The reversal of 81128168 is 86182118.

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, 460868 + ... + 461043.

It is an arithmetic number, because the mean of its divisors is an integer number (10371510).

Almost surely, 2^81128168 is an apocalyptic number.

81128168 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

81128168 is an abundant number, since it is smaller than the sum of its proper divisors (84815992).

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

81128168 is a wasteful number, since it uses less digits than its factorization.

81128168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921928 (or 921924 counting only the distinct ones).

The product of its digits is 6144, while the sum is 35.

The square root of 81128168 is about 9007.1176299635. The cubic root of 81128168 is about 432.9029610071.

The spelling of 81128168 in words is "eighty-one million, one hundred twenty-eight thousand, one hundred sixty-eight".