81128108 has 12 divisors (see below), whose sum is σ = 143092992. Its totient is φ = 40244400.

The previous prime is 81128093. The next prime is 81128123. The reversal of 81128108 is 80182118.

It is an interprime number because it is at equal distance from previous prime (81128093) and next prime (81128123).

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, 79343 + ... + 80358.

It is an arithmetic number, because the mean of its divisors is an integer number (11924416).

Almost surely, 2^81128108 is an apocalyptic number.

It is an amenable number.

81128108 is a deficient number, since it is larger than the sum of its proper divisors (61964884).

81128108 is a wasteful number, since it uses less digits than its factorization.

81128108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159832 (or 159830 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 29.

The square root of 81128108 is about 9007.1142992637. The cubic root of 81128108 is about 432.9028542863.

The spelling of 81128108 in words is "eighty-one million, one hundred twenty-eight thousand, one hundred eight".